List of all Config Variables as of Reaper 7.15 and probably are missing some, but should be fairly complete anyway.
These can be used to set configuration-stuff in the preferences, the project-settings, the render-dialog, many context-menus(like MCP or transport-context-menus) and many others.
To change them, you can use the following ReaScript API-functions(requires SWS being installed):

For Integer-values, use SNM_GetIntConfigVar(), SNM_SetIntConfigVar(),
For Double/Float-values, use SNM_GetDoubleConfigVar() and SNM_SetDoubleConfigVar(),
For String-values, use get_config_var_string() and SNM_SetDoubleConfigVar()

as well as the C++-only API-functions:

For (Global) Configuration, use get_config_var()
For Project-configuration, use projectconfig_var_addr() and projectconfig_var_getoffs()

and Reaper's function: get_config_var_string()

who change Reaper's configuration-variables at run time. Just pass the variable-name to the parameter "varname".

Configuration-variables are either double, integer, or string-values. The integer-values are usually(but not always!) bitfields, where every bit stores e.g. the value of a checkbox in the preferences.
That said: one variable may contain the settings for up to 32(or more?) settings at once.
Some variables are string-variables, but they can be accessed with get_config_var_string(), which is available in pre-releases of Reaper only, at the time of writing(I tried to document them as well anyway).
They can also be accessed as integer, but only have the first 8 bytes available(64bits)

Integer-variables are usually 32bits, only those who can be accessed as string-variable can be read as integer as well up to 64bits-integers.

I documented bitfields differently than you usually use them. That means, &16384=1 is actually &16384=16384, while &16384=0 is &16384=0. This is only for better readability of the document, not for any technical reasons.
Some bitfields are documented as "unknown", though it's uncertain if they're unknown or just unused.

Sometimes, variables seem not be existing and valid until they've been set somehow. So if you discover a variable as not functioning, keep in mind it might not be set(yet) and therefore not be available. Just set it and it should appear as existing.

Some variables can't be set. Even if you can set them with new values using the SWS-functions, these new values have no effect on the setting behind them and therefore can only be used for getting their current setting.
So test this out beforehand, if you need to get/set a specific variable in your script.

Setting some of the variables results in a different behavior, as you might expect them to behave.
Such example is mastermutesolo, where you can set the master's mute and solo-states successfully, however, the UserInterface of Reaper will NOT reflect that. It rather will show the old mute-solo-state instead.
Another such example is reccfg, where you can set another recording-audio-format, but setting it to Video, GIF or AudioCD will result in strange behavior of the Project Settings-dialog, even though you can successfully record in these formats as well.
So doublecheck them twice for any side-effects. These sideeffects aren't documented much in here(too much work for one young gal like me ;) )

I also document limitations with variables within this textfile. These are not taken from actually setting these variables, but rather taken from the limitations imposed by setting-dialogs. So, even if I write about limitations, other values may be possible as well, though I would say, this could lead to unpredictable behavior of Reaper.
It is unclear, if the SWS-functions (or the underlying C++ function get_config_var) are checking for valid values to reject them, if invalid(and prevent possible crashes, etc).
So, be better on the safe side and stay within the boundaries I document.

I tried to retain the original names of dialogs, settings, menu-entries, checkboxes, etc, so you can search their names in this document to find their accompanying config-variable easier.

Many variables are also influenced by actions, so refer to Reaper-All_ConfigVars_as_toggled_by_Actions.txt to get a full list of which actions triggers which configvar.

Keep in mind:

If you change settings, these changes might not be stored in Reaper's setting-files, so they may get lost, when Reaper is exited.
If you want to retain settings, you need to set them in the corresponding ini-files as well(usually the reaper.ini) with BR_Win32_WritePrivateProfileString() Only exception I know of is edit_fontsize, which sets the fontsize in Reaper's IDE. Changing this makes this setting immediately persisting.

Project-settings should be stored the next time a project is saved, but doublecheck that, if storing projectsettings into a projectfile is a must in your script!
Some project-settings can be stored into the reaper.ini as default-project-settings. I documented that as well, when I could find that out.

documented by Meo-Ada Mespotine mespotine.de for the ultraschall.fm-project
some of the variable-names were collected by various users in the Reaper-forums, thanx for that :)
This document is licensed under creative-commons cc-by-sa-nc license. More information about Creative Commons, at creativecommons.org

If you want, you can thank me for this work at ultraschall.fm/danke, where you can find my Amazon-wishlist(hint hint, nudge nudge ;) )

396 variables documented, including settings for:

Preferences, Playrate context menu, Help-information display context-menu, Transport-Context Menus, Project Settings, the Master VU-settings,
Ruler context-menu, Metronome and pre-roll settings, Projecttab-context-menu, MixerControlPanel-context menu, Action-menu,
TrackControlPanel-context menu, Crossfade-editor, FX browser, Peaks Display Settings, Scale Finder, Screensets/Layouts
the View-menu, the Options-menu, Customize menus/toolbars, Adjust Entire Tempo Envelope, Quantize Item Positions, MIDI Editor and
Render to File-dialogs are completely documented, as well as all variables toggled by actions only.

Some variables I couldn't trigger, so the following 22 aren't documented and are unknown:

ctrlcopyitem, disk_rdblksex, itemdblclk, itemprops, itemprops_timemode, maxspeakgain, metronome_flags, midiins, midiins_cs, mousemovemod, newfnopt, projmidieditor, renderqdelay, rightclickemulate, scoreminnotelen, scorequant, selitemtop, titlebarreghide, tsmarker, vstfolder_settings, projmeasoffsruler, miscopts

The following variables can be triggered by actions only

aot, cueitems, itemtexthide, psmaxv, psminv, templateditcursor

the following variables are available in pre-releases of Reaper only

none currently

View: Toggle show media cues in items as triggered by action 40691(in sections Main, Media Explorer, MIDI Editor, MIDI Eventlist Editor, MIDI Inline Editor)  
It is an integer, actions variable.  

Can be affected by the following actions:
  View: Toggle show media cues in items

>0, togglestate off  
>1, togglestate on  

Stored in reaper.ini under the same name in the section REAPER.  

View: Toggle show/hide item  labels
It is an integer, actions variable.

Can be affected by the following actions:
  View: Toggle show/hide item labels

>0, action is toggled on  
>1, action is toggled off  

Stored in reaper.ini under the same name in the section REAPER.  

Several settings, as set in the context-menu of the envelope manager  
It is an integer, project variable.
          
>&1=0, Target Envelope manager when clicking track/take envelope buttons(shift+click to override) - unchecked
>&1=1, Target Envelope manager when clicking track/take envelope buttons(shift+click to override) - checked

Stored in reaper.ini under the same name in the section REAPER, when Save as default project settings has been clicked.  

Stores the settings for the help-information-display under the TCP, as set in it's accompanying context-menu, as well the performance meter window-context menu.
It is an integer/integer-bitfield, help variable.

>Only one of the following can be set:  
   0, No information display  
   1, Reaper tips  
   2, Track/item count  
   3, selected track/item/envelope details  
   4, CPU/RAM use, time since last save  

>This one can be set all the times:  
   &65536=0, Show mouse editing-help(on), checked  
   &65536=1, Show mouse editing-help(off), unchecked  

>Context-menu in performane meter display:
   &131072=0, &262144=0, Display CPU utilization as 100% = all cores fully utilized
   &131072=1, &262144=0, Display CPU utilization as 1.0c = 1 core fully utilized
   &131072=1, &262144=1, Display CPU utilization as 1.0! = longest block is realtime (worst case)
          
Stored in reaper.ini under the same name in the section REAPER.  

The fontsize of the Reascript/JSFX-IDE.  
It is an integer, misc variable.

>negative values are treated like the positive value+1; 16 is default  

Stored in reaper.ini under the same name in the section REAPER; is updated as soon as the variable is changed.  

It is a string of the filename with path of the project, though only accessible as integer, and therefore the first characters.
It is an integer, misc variable.

Don't access it as double, or Reaper might crash!

The number of times, a markerlist in any project has been updated since Reaper started.      
A markerlist is just the list of markers, that a project contains.  
Counts up, if a marker is added, set, deleted from any project opened in Reaper.  
This counter includes already closed projects as well  
This is an integer-value, variable.  

>0, no marker has been updated yet  
>1 and higher, markers have been updated in any opened project  

Stores some kind of color-theme-settings for Reaper's IDE.  
Seems not to store the colors themselves, but rather count up, when one or more colors are changed.  
It is an integer, misc variable.

>0 to 2147483647; higher values become negative  

The currently used font in Reaper's IDE.
It is a string, misc variable.

When storing a new font, use "" to use the default-IDE-font.

Keep in mind, that only mono-spaced-fonts will look good. Other fonts might have artifacts.

Stored in reaper.ini under the same name in the section REAPER.  

In project MIDI item-inputbox as set in Preferences -> Recording
It is a string, preferences variable.

Stored in reaper.ini under the same name in the section REAPER.  

Settings in the Item-Notes-dialog
It is an integer, item-note variable.
  
>&8=0, Word wrap-checkbox(updated only, when itemnotes window gets closed) - unchecked
>&8=1, Word wrap-checkbox(updated only, when itemnotes window gets closed) - checked

>256=0, Enter to close, Shift+Enter for new line-checkbox - unchecked
>256=1, Enter to close, Shift+Enter for new line-checkbox - checked

Stored in reaper.ini under the same name in the section REAPER.

The currently selected theme.  
It is a string, theme variable.

><classic> for the classic-theme; others are path+filename.ReaperTheme  
          
Stored in reaper.ini under the same name in the section REAPER.  

The maximum shown peak-gain of the shown peaks in MediaItems  
It is a double-float, misc variable.
  
  >values, who change the gain range from -180(negative gain) to 3(positive gain, possibly higher?)
  >0, seems to be no gain
  >default is 64.0

The Metronome through Monitor FX-menuentry, as set in Metronome and Pre-roll-settings-dialog(Action: 40363) -> I/O-Button
It is an integer, metronome variable.

  >0, menu is unchecked; 1, menu is checked

Stored in reaper.ini under the same name in the section REAPER.  

The Display gain, as set in the RMS metering settings-section of the Master VU settings-dialog, opened when right-clicking the Master-VU.  
In the dialog, it is treated as a simple float, means, 111 becomes 11.1 in the dialog. Negative values input in the dialog will be  
set to +1, means: -8 will become -7.9 in the variable and the next time you open the dialog.  
It is an integer, master-vu-context variable.

>-9999989 to 9999999.0; in dB; 0 for 0dB  

Stored in reaper.ini under the same name in the section REAPER.  

The Master VU settings, as set in the Master VU settings-dialog, opened when right-clicking the Master-VU.  
It is an integer-bitfield, master-vu-context variable.

>&1 and &2  

  >> 0 0, Peak Only  
  >> 0 1, RMS Only  
  >> 1 0, Peak+RMS  

>&4=0, Top Label: Peak  
>&4=1, Top Label: RMS  

Stored in reaper.ini under the same name in the section REAPER.  

The Display offset, as set in the RMS metering settings-section of the Master VU settings-dialog, opened when right-clicking the Master-VU.  
In the dialog, it is treated as a simple float, means, 111 becomes 11.1 in the dialog. Negative values input in the dialog will be  
set to +1, means: -8 will become -7.9 in the variable and the next time you open the dialog.  
It is an integer, master-vu-context variable.

>-9999989 to 9999999.0; in dB; 0 for 0dB  

Stored in reaper.ini under the same name in the section REAPER.  

The Red threshold, as set in the RMS metering settings-section of the Master VU settings-dialog, opened when right-clicking the Master-VU.  
In the dialog, it is treated as a simple float, means, 111 becomes 11.1 in the dialog. Negative values input in the dialog will be  
set to +1, means: -8 will become -7.9 in the variable and the next time you open the dialog.  
It is an integer, master-vu-context variable.

>-9999989 to 9999999.0; in dB; 0 for 0dB  

Stored in reaper.ini under the same name in the section REAPER.  

The Window size, as set in the RMS metering settings-section of the Master VU settings-dialog, opened when right-clicking the Master-VU.  
It is an integer, master-vu-context variable.

>0 to 9999999; milliseconds  

Stored in reaper.ini under the same name in the section REAPER.  

The several preroll-settings, as set in the Pre-Roll-section of the "Metronome and pre-roll settings"-dialog(also options-menu)  
It is an integer-bitfield, metronome variable.

Can be affected by the following actions:
  Pre-roll: Toggle pre-roll on record [deprecated duplicate]
  Pre-roll: Toggle pre-roll on play
  Pre-roll: Toggle pre-roll on record

>&1=0, Pre-roll before playback(off) - unchecked  
>&1=1, Pre-roll before playback(on) - checked  
  
>&2=0, Pre-roll before recording(off) - unchecked  
>&2=1, Pre-roll before recording(on) - checked  

>&4=0, Start pre-roll at start of measure(on) - checked  
>&4=1, Start pre-roll at start of measure(off) - unchecked  

>&8=0, Start count-in at start of measure(set in the Metronome-section)(off) - unchecked  
>&8=1, Start count-in at start of measure(set in the Metronome-section)(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

The Pre-roll measures-inputbox, as set in the Pre-Roll-section of the "Metronome and pre-roll settings"-dialog(also options-menu)  
It is a double-float, metronome variable.  

>0 to 1e+021; higher values can't be set in the reaper.ini, though in the variable  

Stored(with higher precision) in reaper.ini under the same name in the section REAPER.      

Several settings, as set in Quantize Item Positions(action 40316)  
It is an integer-bitfield, preferences variable.

>&1=0, Move grouped items with selected items(off) - unchecked  
>&1=1, Move grouped items with selected items(on) - checked  

>&2=0, Extend start of items to overlap with earlier items by-checkbox(off)- unchecked  
>&2=1, Extend start of items to overlap with earlier items by-checkbox(on)- checked  

>&4=0, Shorten earlier items if quantized items overlap by more than-checkbox(off) - unchecked  
>&4=1, Shorten earlier items if quantized items overlap by more than-checkbox(on) - checked  

>&8=0, Quantize item ends and stretch item to fit(off) - unchecked  
>&8=1, Quantize item ends and stretch item to fit(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Extend start of items to overlap with earlier items by-inputbox, as set in Quantize Item Positions(action 40316)  
It is an integer, preferences variable.

>0 to 2147483647; in milliseconds; higher values become negative;  

Stored in reaper.ini under the same name in the section REAPER.  

Shorten earlier items if quantized items overlap by more than-inputbox, as set in Quantize Item Positions(action 40316)  
It is an integer, preferences variable.

>0 to 2147483647; in milliseconds; higher values become negative;  

Stored in reaper.ini under the same name in the section REAPER.  

Quantize to-dropdown/inputlist, as set in Quantize Item Positions(action 40316)  
It is a double-float, preferences variable.

>0.00390625(1/256)  
>0.0078125(1/128)  
>0.015625(1/64)  
>0.020833333333333(1/32T)  
>0.03125(1/32)  
>0.041666666666667(1/16T)  
>0.0625(1/16)  
>0.083333333333333(1/8T)  
>0.125(1/8)  
>0.16666666666667(1/4T)  
>0.25(1/4)  
>0.5(1/2)  
>1.0(1)  
>2.0(2)  
>4.0(4)  
>other values are possible as well, with minimum 1/256  

Stored in reaper.ini under the same name in the section REAPER.  

The settings behind the Edit fields-Button, as set in Screensets/Layouts located in menu View -> Screensets/Layouts  
It is an integer, preferences variable.
The value is negative for some reason...  

>&4=0, Views -> Track cursor position(on) - checked  
>&4=1, Views -> Track cursor position(off) - unchecked  

>&8=0, Views -> Track scroll positions(on) - checked  
>&8=1, Views -> Track scroll positions(off) - unchecked  

>&16=0, Views -> Track TCP status(on) - checked  
>&16=1, Views -> Track TCP status(off) - unchecked  


>&64=0, Views -> Track mixer status(on) - checked  
>&64=1, Views -> Track mixer status(off) - unchecked  

>&128=0, Views -> Horizontal zoom(on) - checked  
>&128=1, Views -> Horizontal zoom(off) - unchecked  

Stored in reaper.ini under the same name in the section REAPER.  

The settings behind the Edit fields-Button, as set in Screensets/Layouts located in menu View -> Screensets/Layouts  
The value is negative for some reason...  
It is an integer, preferences variable.

>&1=0, Windows -> Main window position(on) - checked  
>&1=1, Windows -> Main window position(off) - unchecked  

>&2=0, Windows -> Tool window position(on) - checked  
>&2=1, Windows -> Tool window position(off) - unchecked  

>&32=0, Windows -> Docker selected tab(on) - checked  
>&32=1, Windows -> Docker selected tab(off) - unchecked  

>&512=0, Windows -> Mixer flags(on) - checked  
>&512=1, Windows -> Mixer flags(off) - unchecked  

>&1024=0, Windows -> Last focus(on) - checked  
>&1024=1, Windows -> Last focus(off) - unchecked  

>&2048=0, Windows -> Layouts(on) - checked  
>&2048=1, Windows -> Layouts(off) - unchecked  

Stored in reaper.ini under the same name in the section REAPER.  

Auto-save when switching screensets-checkbox, as set in Screensets/Layouts located in menu View -> Screensets/Layouts  
It is an integer, preferences variable.

>0, Auto-save when switching screensets(off) - unchecked  
>1, Auto-save when switching screensets(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Scroll view when tracks activated-entry, as set in the Mixer-context-menu.  
It is an integer, preferences variable.

Can be affected by the following actions:
  Mixer: Toggle scroll view when tracks activated

>0, don't scroll view(off) - unchecked  
>1, scroll view(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Show master track, as set in the TrackControlPanel-context menu
It is an integer, preferences variable.

Can be affected by the following actions:
  View: Toggle master track visible
  Toggle show master tempo envelope
  Toggle show master track and tempo envelope

>0, don't show master track - unchecked  
>1, show master track - checked  
  
Stored in reaper.ini under the same name in the section REAPER, when Save as default project settings has been clicked.

Stores the Opacity-fader for Spectral Peaks, as set in the Peaks Display Settings from View -> Peaks Display Settings  
It is an integer, preferences variable.

>0 to 255; 192 for default  

Stored in reaper.ini under the same name in the section REAPER.  

Stores the variance-level for Spectral Peaks, as set in the Peaks Display Settings from View -> Peaks Display Settings  
It is an integer, preferences variable.

>0(for displayed value 0) to 256(for displayed value 1.00); default 96(for displayed value 0.38)  

Stored in reaper.ini under the same name in the section REAPER.

Fade non tonal content to theme peaks color-context menu for Spectral Peaks, as set in the Peaks Display Settings from View -> Peaks Display Settings  
It is an integer, preferences variable.

>0, don't fade - unchecked  
>1, fade - checked  

Stored in reaper.ini under the same name in the section REAPER.  

The high-end of the spectrum, starting point for Spectral Peaks, as set in the Peaks Display Settings from View -> Peaks Display Settings  
That means, the right side of the spectrum.  
It is a double-float, preferences variable.

>0.513 is default settings; lower push the spectrum together; higher, stretch it apart until about 1.585(default value from specpeak_huel),  
   from which it's pushed together again  

Stored in reaper.ini under the same name in the section REAPER.  

The low-end of the spectrum, starting point for Spectral Peaks, as set in the Peaks Display Settings from View -> Peaks Display Settings  
That means, the left side of the spectrum.  
It is a double-float, preferences variable.

>1.585 is default settings; higher push the spectrum together; lower, stretch it apart until about 0.513(default value from specpeak_hueh),  
   from which it's pushed together again  

Stored in reaper.ini under the same name in the section REAPER.  

The lo-frequency-part for Spectral Peaks, as set in the Peaks Display Settings from View -> Peaks Display Settings  
That means, the frequency shown in the lower part of the preview-Spectral-Peaks-area.  
It is a double float, preferences variable.

>0(for displayed 14Hz to 3904Hz) to 200(14Hz to 7985Hz); default is 0  

Stored in reaper.ini under the same name in the section REAPER.  

Stores the Noise Threshold-fader for Spectral Peaks, as set in the Peaks Display Settings from View -> Peaks Display Settings  
It is a double-float, preferences variable.

>16(for displayed value 0.25) to 0.5(for displayed value 8.0); default is 257(for displayed value 1.0)  

Stored in reaper.ini under the same name in the section REAPER.  

Use all MIDI inputs-checkbox, as set Scale Finder located in View -> Scale Finder as well as in  
  Preferences -> Mouse Modifiers(only MIDI CC event, MIDI CC lane and MIDI CC segment-Modifiers ) and in MIDI Editor -> Options -> Velocity editing lane and  
  in MIDI Editor -> Options -> CC events in multiple media items.
It is an integer-bitfield, preferences variable.

>&2=0, Allow selecting a single event in a CC lane with a mouse click(on) - checked  
>&2=1, Allow selecting a single event in a CC lane with a mouse click(off) - unchecked  

>&8=0, Use all MIDI inputs(on) - checked  
>&8=1, Use all MIDI inputs(off) - unchecked  

>&16=0, Draw and edit on all tracks(MIDI Editor -> Options -> CC events in multiple media items)  
>&16=1, Edit on all tracks(MIDI Editor -> Options -> CC events in multiple media items)  

>&32=0, Edit CC-Events on all tracks(Tracklist in MIDI-Editor) ->unchecked
>&32=1, Edit CC-Events on all tracks(Tracklist in MIDI-Editor) ->checked

>&64=0, Edit previous note within current grid division(MIDI Editor -> Options -> Velocity editing lane)  
>&64=1, Edit only when mouse is over velocity bar(MIDI Editor -> Options -> Velocity editing lane)  

>&128=0, Right click deletes CC events-checkbox(Preferences -> Mouse modifiers -> MIDI CC segment - left click/drag) -> checked
>&128=1, Right click deletes CC events-checkbox(Preferences -> Mouse modifiers -> MIDI CC segment - left click/drag) -> unchecked

>&256=0, Draw/edit immediately on mouse click-checkbox(Preferences -> Mouse modifiers -> MIDI CC segment - left click/drag) -> unchecked
>&256=1, Draw/edit immediately on mouse click-checkbox(Preferences -> Mouse modifiers -> MIDI CC segment - left click/drag) -> checked

The minimum length of a note, in the notation-view of the MIDI-Editor.
It is an integer, preferences variable.
  
  >4, one full note; lower than 4 are fractions of a note
  
Stored in reaper.ini under the same name in the section REAPER, when Save as default project settings has been clicked.

unknown  
It is an integer, unknown variable.

Stored in reaper.ini under the same name in the section REAPER, when Save as default project settings has been clicked.

Include default menu as submenu-checkbox in Menu-Editor as well as some settings in Preferences -> Appearance  
It is an integer-bitfield, preferences variable.

>&1=0, include default menus as submenu(Menueditor)(off) - unchecked  
>&1=1, include default menus as submenu(Menueditor)(on) - checked  

>&4=0, Don't scale toolbar buttons below 1:1(off) - unchecked  
>&4=1, Don't scale toolbar buttons below 1:1(on) - checked  

>&16=0, Don't scale toolbar buttons above 1:1 (on) - checked  
>&16=1, Don't scale toolbar buttons above 1:1 (off) - unchecked  

>&256=0, Frameless floating toolbar windows(off) - unchecked  
>&256=1, Frameless floating toolbar windows(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Several settings, as set in Preferences -> Envelope Display as well as in Preferences -> Appearance and Preferences -> Peaks/Waveforms  
It is an integer-bitfield, preferences variable.

>&1=0, Show new envelopes in separate envelope lanes-checkbox(Preferences -> Envelope Display)(off) - unchecked  
>&1=1, Show new envelopes in separate envelope lanes-checkbox(Preferences -> Envelope Display)(on) - checked  

>&2=0, Changing envelope in lane: Moves old envelope to media lane(Preferences -> Envelope Display)  
>&2=1, Changing envelope in lane: Hides old envelope(Preferences -> Envelope Display)  

>&4=0, Draw faint peaks in automation envelope lanes(Preferences -> Peaks/Waveforms)(off) - unchecked  
>&4=1, Draw faint peaks in automation envelope lanes(Preferences -> Peaks/Waveforms)(on) - checked  

>&8=0, Antialiased fades and envelopes(on) - checked  
>&8=1, Antialiased fades and envelopes(off) - unchecked  

>&16=0, Filled automation envelopes(on) - checked  
>&16=1, Filled automation envelopes(off) - unchecked  

>&32=0, Filled envelopes when drawn over media(only available with &16=1)(off) - unchecked  
>&32=1, Filled envelopes when drawn over media(only available with &16=1)(on) - checked  
>&64=0, Horizontal grid lines in automation layers(on) - checked  
>&64=1, Horizontal grid lines in automation layers(off) - unchecked  

Stored in reaper.ini under the same name in the section REAPER.  

Show dotted grid lines-checkbox, as set in Preferences -> Appearance  
It is an integer, preferences variable.  

>0, don't show dotted grid-line(off) - unchecked  
>1, don't show dotted grid-line(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Grid line Z order-dropdownlist, as set in Preferences -> Appearance  
It is an integer, preferences variable.

>0, Over items  
>1, Through items  
>2, Under items  

Stored in reaper.ini under the same name in the section REAPER.  

Marker line Z order-dropdownlist, as set in Preferences -> Appearance  
It is an integer, preferences variable.

>0, Over items  
>1, Through items  
>2, Under items  

Stored in reaper.ini under the same name in the section REAPER.  

Show guide lines when editing-checkbox, as set in Preferences -> Appearance
It is an integer, preferences variable.

>0, don't show guide lines(off) - unchecked  
>1, show guide lines(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Item volume control-dropdownlist, as set in Preferences -> Media  
This is not(!) located in Preferences -> Appearance-Media!  
When setting &16384 of config variable itemicons, you can set knob-representation  
It is an integer, preferences variable.

>0, Handle: +0dB is top of item  
>1, Handle: +0dB is center of item  

Stored in reaper.ini under the same name in the section REAPER.  

Maximum number of lanes, when showing overlapping items in lanes-inputbox, as set in Preferences -> Appearance  
It is an integer, preferences variable.

>1 to 2147483647; in lanes  

Stored in reaper.ini under the same name in the section REAPER.  

Faster text rendering (reduces antialiasing)-checkbox, as set in Preferences -> Appearance  
It is an integer, preferences variable.

>0, Faster text rendering(on) - checked  
>1, don't use faster text rendering(off) - unchecked  

Stored in reaper.ini under the same name in the section REAPER.  

The minimum height-inputbox as set in Preferences -> Appearance -> Peaks/Waveforms.  
It is an integer, preferences variable.

  >0 to 999 pixels

Stored in reaper.ini under the same name in the section REAPER.  

Play cursor width-inputbox, as set in Preferences -> Appearance  
It is an integer, preferences variable.

>1 to 2147483647; in pixels  

Stored in reaper.ini under the same name in the section REAPER.  

Ruler label spacing-slider, as set in Preferences -> Appearance
It is an integer, preferences variable.

>0 to 100

Stored in reaper.ini under the same name in the section REAPER.

The ruler layout-settings, as set in the Ruler layout-section of the Ruler context-menu as well as in Preferences -> Appearance and  
with actions in the actions-dialog  
It is an integer-bitfield, preferences variable.

Can be affected by the following actions:
  Ruler: Display project regions in lanes
  Ruler: Display project markers in lanes
  Ruler: Display tempo and time signature changes in separate lanes (when size permits)
  Ruler: Display tempo changes
  Ruler: Display time signature changes
  Ruler: Display project regions/markers as gridlines in arrange view
  Ruler: Display time signature changes as gridlines in arrange view
  Ruler: Display region number even if region is named
  Ruler: Display region number/name when region edge is not visible

>&1=0, Display project regions in lanes(on) - checked  
>&1=1, Display project regions in lanes(off) - unchecked  

>&2=0, Display project markers in lanes(on) - checked  
>&2=1, Display project markers in lanes(off) - unchecked  

>&4=0, Display tempo and time signature changes in separate lanes(off) - unchecked  
>&4=1, Display tempo and time signature changes in separate lanes(on) - checked  

>&8=0, Display tempo changes(on) - checked  
>&8=1, Display tempo changes(off) - unchecked  

>&16=0, Display time signature changes(on) - checked  
>&16=1, Display time signature changes(off) - unchecked  

>&32=0, Show project regions/markers in grid(Preferences -> Appearance)(action 42328) (state on) - checked  
>&32=1, Show project regions/markers in grid(Preferences -> Appearance)(action 42328) (state off) - unchecked  

>&64=0, Show time signature changes in grid(Preferences -> Appearance) (action 42329) (state on) - checked  
>&64=1, Show time signature changes in grid(Preferences -> Appearance) (action 42329) (state off) - unchecked  

Stored in reaper.ini under the same name in the section REAPER.  

Show last undo point in menu bar-checkbox, as set in Preferences -> Appearance  
It is an integer, preferences variable.

>0, don't show last undo point(off) - unchecked  
>1, show last undo point(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

The Show status window-checkbox, as set in Preferences -> Media  
This is not(!) located in Preferences -> Appearance-Media!  
It is an integer, preferences variable.

>0, don't show peaks build status  
>1, show peaks build status window  

Stored in reaper.ini under the same name in the section REAPER.  

Draw vertical text bottom-up-checkbox, as set in Preferences -> Appearance  
It is an integer

>0, don't draw vertical text bottom-up(off) - unchecked  
>1, don't draw vertical text bottom-up(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Solid edge-settings, as set in Preferences -> Appearance  
It is an integer-bitfield

>&1=0, Solid edge on time selection highlight(off) - unchecked  
>&1=1, Solid edge on time selection highlight(on) - checked  

>&2=0, Solid edge in loop selection(off) - unchecked  
>&2=1, Solid edge in loop selection(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Tooltip delay-slider in Preferences -> Appearance  
The variable is updated, when dragging the slider, but the reaper.ini-entry is only updated when hitting apply or ok!  
It is an integer, preferences variable.

>200 to 1000; probably milliseconds  

Stored in reaper.ini under the same name in the section REAPER.  

Several settings about tooltips, as set in Preferences -> Appearance  
It is an integer-bitfield, preferences variable.

>&1=0, Tooltips for items/envelopes(on) - checked  
>&1=1, Tooltips for items/envelopes(off) - unchecked  
  
>&2=0, Tooltips for UI elements(on) - checked  
>&2=1, Tooltips for UI elements(off) - unchecked  

>&4=0, Envelope tooltips on hover(on) - checked  
>&4=1, Envelope tooltips on hover(off) - unchecked  

Stored in reaper.ini under the same name in the section REAPER.  

Visual track spacer size-inputbox, as set in Preferences -> Appearance
It is an integer, preferences variable.

>0-2147483647

Stored in reaper.ini under the same name in the section REAPER.  

Pixels between items on adjacent tracks-inputbox, as set in Preferences -> Appearance  
It is an integer, preferences variable.

>0 to 2147483647; in pixels; higher values become negative  

Stored in reaper.ini under the same name in the section REAPER.  

Divide arrange view vertically every-checkbox AND inpubox, as set in Preferences -> Appearance  
It is an integer-bitfield, preferences variable.

Can be affected by the following actions:
  Grid: Divide arrange view vertically by measures

>0, zoom dependent  
>1 to 4095; measures  

>&4096=0, checkbox(off) - unchecked  
>&4096=1, checkbox(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Tail length when using Apply FX to items in milliseconds, as set in Preferences -> Media  
This is not(!) located in Preferences -> Appearance-Media!  
The accompanying entry in the reaper.ini is always config-var-setting+1.
It is an integer

>0 to 2147483647; higher values become negative  

Stored in reaper.ini under the same name in the section REAPER.  

Some checkboxes in the Media Settings-section, as set in Preferences -> Media
This is not(!) located in Preferences -> Appearance-Media!  
It is an integer-bitfield, preferences variable.  

Can be affected by the following actions:
  Options: When importing, copy imported media to project media directory

>&1=0, Copy imported media to project media directory - unchecked  
>&1=1, Copy imported media to project media directory - checked  

>&2=0, Automatically name unnamed tracks on media import - checked  
>&2=1, Automatically name unnamed tracks on media import - unchecked  

>&4=0, Removing trailing numbers - checked  
>&4=1, Removing trailing numbers - unchecked  

>&8=0, Allow drag-import to insert tracks - unchecked
>&8=1, Allow drag-import to insert tracks - checked

>&16=0, Also copy media when pasting into project - unchecked
>&16=1, Also copy media when pasting into project - unchecked

Stored in reaper.ini under the same name in the section REAPER.  

Show non-standard stereo channel pairs(i.e Input2/Input3 etc)-checkbox in the Channel naming/mapping-section, as set in Preferences -> Audio  
It is an integer, Preferences setting

>0, don't show non standard stereo channel pairs(off) - unchecked  
>1, show non standard stereo channel pairs(on) - checked  
          
Stored in reaper.ini under the same name in the section REAPER.  

Several settings regarding closing audio-devices, as set in Preferences -> Audio  
It's an integer-bitfield, preferences variable.

>&1=0, Close audio device when stopped and application is inactive(off) - unchecked  
>&1=1, Close audio device when stopped and application is inactive(on) - checked  

>&2=0, Close audio device when inactive and tracks are record armed(off) - unchecked  
>&2=1, Close audio device when inactive and tracks are record armed(on) - checked  

>&4=0, Close audio device when inactive and ReWire devices are open(off) - unchecked  
>&4=1, Close audio device when inactive and ReWire devices are open(on) - checked  

>&8=0, Close control surface device when stopped and not active applications, as set in Preferences -> Control/OSC/web, unchecked  
>&8=1, Close control surface device when stopped and not active applications, as set in Preferences -> Control/OSC/web, checked  

Stored in reaper.ini under the same name in the section REAPER.  

Close audio device when stopped and active(less responsive)-checkbox, as set in Preferences -> Audio  
It's an integer, preferences variable.

>0, don't close audio when stopped - unchecked  
>1, close audio device when stopped - checked  

Stored in reaper.ini under the same in the section REAPER.  

Several error-messages, that shall be shown, as set in several dialogs, as well as in Preferences -> Audio and in Preferences -> Recording and Preferences -> Track/Send Defaults
It's an integer-bitfield, preferences variable.

>&1=0, Warn when unable to open audio devices(Preferences -> Audio)(on) - checked  
>&1=1, Warn when unable to open audio devices(Preferences -> Audio)(off) - unchecked  
  
>&2=0, MIDI devices-checkbox(Preferences -> Audio)(on) - checked  
>&2=1, MIDI devices-checkbox(Preferences -> Audio)(off) - unchecked  
  
>&4=0, Warn when errors opening surface MIDI devices(Preferences -> Control/OSC/web) - unchecked  
>&4=1, Warn when errors opening surface MIDI devices(Preferences -> Control/OSC/web) - checked  

>&8=0, Warn when recording without tracks armed(Prompt)(Prevent recording from starting when no tracks armed)(off) - unchecked  
>&8=1, Warn when recording without tracks armed(Prompt)(Prevent recording from starting when no tracks armed)(on) - checked  

>&16=0, Warn when changing volume envelope scaling will change envelope sound(Preferences -> Track/Send Defaults)(on) - checked  
>&16=1, Warn when changing volume envelope scaling will change envelope sound(Preferences -> Track/Send Defaults)(off) - unchecked  

>&32=0, Warn when enabled MIDI devices are not present - checked  
>&32=1, Warn when enabled MIDI devices are not present - unchecked  

>&4096=0, Stop processing audio while warning of failed disk writes/disk full - unchecked
>&4096=1, Stop processing audio while warning of failed disk writes/disk full - checked

Stored in reaper.ini under the same name in the section REAPER.  

Tiny-fade-checkboxes, as set in Preferences -> Audio  
It is an integer-bitfield, preferences variable.

>&1=0, Tiny fade out on playback stop(off) - unchecked  
>&1=1, Tiny fade out on playback stop(on) - checked  

>&2=0, Tiny fade out on playback stop(off) - unchecked  
>&2=1, Tiny fade in on playback start(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Default metronome output-dropdownlist in the Channel naming/mapping-section, as set in Preferences -> Audio  
The track-number; set &1024=1 additional to select only mono-channels  
It is an integer-bitfield, preferences variable.

>-1, Use all project master outs  
>0 to 62, stereo pairs channel 1/2 to 63/64(maybe higher possible?)  
>1024 to 1087, channel 1 to 64(maybe higher possible?)  

Stored in reaper.ini under the same name in the section REAPER.  

Reduce CPU use of silent tracks during playback (experimental)-checkbox, as set in Preferences -> Audio  as well as
Disable FX auto-bypass when using offline render/apply FX/render stems-checkbox, as set in Preferences -> Rendering
It is an integer, preferences variable.

>&1=0, Reduce CPU use of silent tracks during playback (experimental)-checkbox - unchecked
>&1=1, Reduce CPU use of silent tracks during playback (experimental)-checkbox - checked

>&4=0, Auto-bypass FX (when set via project or manual setting) even when FX configuration is open-checkbox - unchecked
>&4=1, Auto-bypass FX (when set via project or manual setting) even when FX configuration is open-checkbox - checked

>&8=0, Disable FX auto-bypass when using offline render/apply FX/render stems-checkbox - unchecked
>&8=1, Disable FX auto-bypass when using offline render/apply FX/render stems-checkbox - checked

Stored in reaper.ini under the same name in the section REAPER.  

The Input/Output-channel name aliasing-checkboxes in the section Channel naming/mapping  as set in Preferences -> Audio
It is an integer-bitfield, preferences variable.

>&1=0, Input channel name aliasing/remapping-checkbox(off) - unchecked  
>&1=1, Input channel name aliasing/remapping-checkbox(on) - checked  
  
>&2=0, Input channel name aliasing/remapping-checkbox(off) - unchecked  
>&2=1, Input channel name aliasing/remapping-checkbox(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Automation recording return speed-inputbox, as set in Preferences -> Automation  
It is given in seconds.  
It is a double-float preferences variable.

>0 to 100000000000000.00000000; higher values are possible but produce weird values stored.  

Stored in reaper.ini under the same name in the section REAPER.  

Automation transition time-inputbox, as set in Preferences -> Automation  
It is given in seconds.  
It is a double-float preferences variable.

>0 to 100000000000000.00000000; higher values are possible but produce weird values stored.  

Stored in reaper.ini under the same name in the section REAPER.  

Several settings from the Automation-section, as set in Preferences -> Automation.  
It is an integer-bitfield, preferences variable.

>&1=0, Automatically add envelopes when tweaking parameters in automation write modes(off) - unchecked  
>&1=1, Automatically add envelopes when tweaking parameters in automation write modes(on) - checked  

>&2=0, Hidden envelopes: Display read automation feedback(on) - checked  
>&2=1, Hidden envelopes: Display read automation feedback(off) - unchecked  

>&4=0, Hidden envelopes: Allow writing automation(off) - unchecked  
>&4=1, Hidden envelopes: Allow writing automation(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Several settings from the Automation-section, as set in Preferences -> Automation as well as the Envelope Manager-context menu.
It is an integer-bitfield, preferences variable.

>&1=0, Reset latch state when looping(on) - checked  
>&1=1, Reset latch state when looping(off) - unchecked  

>&2=0, Default: All FX parameters expanded
>&2=1, Default: All FX parameters collapsed

Stored in reaper.ini under the same name in the section REAPER.  

When adding volume/pan envelopes, apply trim to envelope and reset trim-dropdownlist from the Automation-section, as set in Preferences -> Automation.  
It is an integer-bitfield, preferences variable.

>&1 and &2, the dropdownlist  

  >> 0 0, Always  
  >> 1 0, In read/write  
  >> 0 1, Never  

Stored in reaper.ini under the same name in the section REAPER.  

When adding volume/pan envelopes, apply trim to envelope and reset trim-dropdownlist from the Automation-section, as set in Preferences -> Automation.  
It is an integer, preferences variable.

>0, Switch to trim/read mode  
>1, Switch to read mode  
>2, Switch to touch mode  
>3, Remain in write mode  
>4, Switch to latch mode  

Stored in reaper.ini under the same name in the section REAPER.  

Default edge transition time for new automation items ms(max 200)-inputbox, as set in Preferences -> Automation -> Automation items
It is a double, preferences variable.

  0 to 200(though higher values can be set)

Stored in reaper.ini under the same name in the section REAPER, but with higher precision.  

Limit auto-saved backups to most recent-inputbox, as set in Preferences -> Backups      
It is an integer, preferences variable.

>0 - 2147483647 days

Stored in reaper.ini under the same name in the section REAPER.  

Auto-save interval-inputbox from the Auto save-section, as set in Preferences -> Backups.  
It is an integer preferences variable.

>0 to 2147483647; in seconds; higher values become negative  

Stored in reaper.ini under the same name in the section REAPER.  

Auto-save interval-dropdownlist from the Project saving-section, as set in Preferences -> Backups.  
It is an integer preferences variable.

>0, when not recording  
>1, when stopped  
>2, any time  

Stored in reaper.ini under the same name in the section REAPER.  

Limit backups to most recent-inputbox, as set in Preferences -> Backups      
It is an integer, preferences variable.

>0 - 2147483647 days

Stored in reaper.ini under the same name in the section REAPER.  

Several settings from the Project saving-section, as set in Preferences -> Backups.  
It is an integer-bitfield, preferences variable.

>&1=0, Preserve previously-saved version of project as .rpp-back - unchecked  
>&1=1, Preserve previously-saved version of project as .rpp-back - checked  
  
>&2=0, Auto-save to project file(not recommended)(off) - unchecked  
>&2=1, Auto-save to project file(not recommended)(on) - checked  

>&4=0, Auto-save to timestamped file in project directory(off) - unchecked  
>&4=1, Auto-save to timestamped file in project directory(on) - checked  

>&8=0, Auto-save to timestamped file in additional directory(off) - unchecked  
>&8=1, Auto-save to timestamped file in additional directory(on) - checked  
      
>&16=0, Preserve previously-saved versions of projact as -[timestamp].rpp-bak(off) - unchecked  
>&16=1, Preserve previously-saved versions of projact as -[timestamp].rpp-bak(on) - checked  

>&32=0, Limit backups to most recent-checkbox - unchecked

>&64, Limit backups to most recent-dropdownmenu
    0 - copies
    1 - unique days
    
>&128=0, Limit auto-saved backups to most recent-checkbox - unchecked
>&128=1, Limit auto-saved backups to most recent-checkbox - checked

>&256, Limit auto-saved backups to most recent-dropdownlist
    0, copies
    1, unique days

>&512=0, Limit backups to most recent-checkbox - unchecked
>&512=1, Limit backups to most recent-checkbox - checked

>&1024 &2048, Limit backups to most recent-dropdownlist
  >>0 0, copies for current project
  >>0 1, copies for all projects
  >>1 0, unique days for current project
  >>1 1, unique days for all projects

>&4096=0, Save timestamped backups to Backups project subdirectory-checkbox - unchecked
>&4096=1, Save timestamped backups to Backups project subdirectory-checkbox - checked

>&8192=0, Save auto-saved project backups to AutoSaves project subdirectory - unchecked
>&8192=1, Save auto-saved project backups to AutoSaves project subdirectory - checked

Stored in reaper.ini under the same name in the section REAPER.  

Several settings, as set in Preferences -> Buffering.  
It is an integer-bitfield, preferences variable.

>&2=0, use native events for synchronizing (recommended)(on) - checked  
>&2=1, use native events for synchronizing (recommended)(off) - unchecked  

>&128=0, Use old v4.x worker thread scheduling(off) - unchecked  
>&128=1, Use old v4.x worker thread scheduling(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Auto-detect the number of needed audio processing threads-checkbox, as set in Preferences -> Buffering  
It is an integer, preferences variable.

>0, don't auto-detect(allows usage of variable workthread)(off) - unchecked  
>1, auto-detect(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Allow memory mapping of peak-files (faster, but uses more address space)-checkbox, as set in Preferences -> Buffering -> Advanced Disk I/O options...  
It is an integer, preferences variable.

>0, Don't allow memory mapping(off) - unchecked  
>1, Allow memory mapping(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

The Fully-buffer peak files smaller than-inputbox as set in Preferences -> Buffering -> Advanced Disk I/O Settings  
It is an integer, preferences variable.

  >0 to 2147483647 in kilobytes

Stored in reaper.ini under the same name in the section REAPER.  

The Fully-buffer peak files smaller than-inputbox as set in Preferences -> Buffering -> Advanced Disk I/O Settings  
It is an integer, preferences variable.

  >0 to 2147483647 in kilobytes

Stored in reaper.ini under the same name in the section REAPER.  

Read Buffers-inputbox, as set in Preferences -> Buffering -> Advanced Disk I/O options...-button -> Disk reads-area
It is an integer-bitfield, preferences variable.  

>2-2147483647; number of buffers; default is 3

Stored in reaper.ini under the same name in the section REAPER.  

Preferred disk read mode-dropdownlist, as set in Preferences -> Buffering -> Advanced Disk I/O options...  
It is an integer, preferences variable.

>0, Asynchronous unbuffered  
>1, Asynchronous buffered (default)  
>2, Synchronous  

Stored in reaper.ini under the same name in the section REAPER.  

Read buffer size-inputbox, as set in Preferences -> Buffering -> Advanced Disk I/O options...  
It is an integer, preferences variable.  

>4096 to 2147483647; in bytes; default is 262144  

Write buffers, as set in Preferences -> Buffering -> Advanced Disk I/O options...  
Influences disk_wrblks2 to size of config variables disk_wrblks, when disk_wrblks>=disk_wrblks2
It is an integer, preferences variable.

>2 to 2147483647; number of buffers; default is 16  

Stored in reaper.ini under the same name in the section REAPER.  

Write buffers (maximum), as set in Preferences -> Buffering -> Advanced Disk I/O options...  
Influenced by disk_wrblks to size of config variables disk_wrblks, when disk_wrblks>=disk_wrblks2
It is an integer, preferences variable.

>2 to 2147483647; number of buffers; default is 128  

Stored in reaper.ini under the same name in the section REAPER.  

Preferred disk write mode-dropdownlist, as set in Preferences -> Buffering -> Advanced Disk I/O options...  
It is an integer preferences variable.

>0, Asynchronous (default)  
>1, Synchronous  
>2, Asynchronous (write-through)  

Stored in reaper.ini under the same name in the section REAPER.  

Write buffer size-inputbox, as set in Preferences -> Buffering -> Advanced Disk I/O options...  
It is an integer, preferences variable

>4096 to 2147483647; in bytes; default is 65536  

Stored in reaper.ini under the same name in the section REAPER.  

prebuffer-inputbox, as set in Preferences -> Buffering  
It is an integer, preferences variable.

>0 to 100; in percent; default is 100  

Stored in reaper.ini under the same name in the section REAPER.  

Render-ahead-inputbox in the FX processing/multiprocessing settings, as set in Preferences -> Buffering.  
Affects renderaheadlen2 as well!  
It is an integer, preferences variable.

>0 to 5000; in milliseconds; default is 200  

Stored in reaper.ini under the same name in the section REAPER.  

Is influenced by renderaheadlen. If renderaheadlen is less than 200, then renderaheadlen2 is half of it. If renderaheadlen is higher than 200,  
then renderaheadlen2 is maximum 100.  
Affects renderaheadlen as well!  
It is an integer, preferences variable.

>0 to 100; in milliseconds  

Stored in reaper.ini under the same name in the section REAPER.  

Allow live FX multiprocessing on-inputbox in section FX processing/multiprocessing settings, as set in Preferences -> Buffering.  
It is an integer, preferences variable.

>2 to 999999999; number of cpus; 0 seems to be the existing count of all cpus in the system  

Stored in reaper.ini under the same name in the section REAPER.  

Allow live FX multiprocessing on-checkbox, as set in Preferences -> Buffering  
It is an integer, preferences variable.

>0, don't allow(off) - unchecked  
>1, allow(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Thread priority-dropdownlist, as set in Preferences -> Buffering  
It is an integer, preferences variable.

>0, Idle  
>1, Below Normal  
>2, Normal  
>3, Above Normal  
>4, Highest(recommended)  
>5, Time Critical  

Stored in reaper.ini under the same name in the section REAPER.  

Behavior-dropdownlist, as set in Preferences -> Buffering  
It is an integer, preferences variable.

>-1, Automatic(experimental)  
>0, 0 - Relaxed  
>1, 1  
>2, 2  
>3, 3  
>4, 4 - Default  
>5, 5  
>6, 6  
>7, 7  
>8, 8 - Aggressive  
>9, 9  
>10, 10  
>11, 11  
>12, 12  
>13, 13  
>14, 14  
>15, 15  Very Aggressive  

Stored in reaper.ini under the same name in the section REAPER.  

Media buffer size when per-take FX UI open-inputbox, as set in Preferences -> Buffering  
It is an integer, preferences variable.

>0 to 1200; in milliseconds; default is 200  

Stored in reaper.ini under the same name in the section REAPER.  

Media buffer size-inputbox, as set in Preferences -> Buffering  
It is an integer, preferences variable.

>0 to 6000; in milliseconds; default is 1200  

Stored in reaper.ini under the same name in the section REAPER.  

Several render-settings, as set in Preferences -> Rendering as well as Preferences -> Buffering, as well as in Preferences -> Rendering  
It is an integer-bitfield, preferences variable.

>&1=0, Anticipative FX processing - superior multiprocessing and lower interface latencies-checkbox(the section, Preferences -> Buffering)(enables renderaheadlen and workrender&2/&16)(off) - unchecked  
>&1=1, Anticipative FX processing - superior multiprocessing and lower interface latencies-checkbox(the section, Preferences -> Buffering)(enables renderaheadlen and workrender&2/&16)(on) - checked  

>&2=0, Allow on tracks without FX-checkbox(the section, Preferences -> Buffering)(off) - unchecked  
>&2=1, Allow on tracks without FX-checkbox(the section, Preferences -> Buffering)(on) - checked  

>&8=0, Limit apply FX/render stems to realtime (good for some plug-ins)(off) - unchecked  
>&8=1, Limit apply FX/render stems to realtime (good for some plug-ins)(on) - checked  

>&16=0, Allow on tracks with open MIDI editors-checkbox(the section, Preferences -> Buffering)(on) - checked  
>&16=1, Allow on tracks with open MIDI editors-checkbox(the section, Preferences -> Buffering)(off) - unchecked  

>&32=0, When freezing, render the entire track length if there are track or per-take FX(Preferences -> Rendering)(off) - unchecked  
>&32=1, When freezing, render the entire track length if there are track or per-take FX(Preferences -> Rendering)(on) - checked  

>&64=0, Include tail when freezing entire tracks(Preferences -> Rendering)(on) - checked  
>&64=1, Include tail when freezing entire tracks(Preferences -> Rendering)(off) - unchecked  

>&256=0, Disable media buffering for tracks that are selected(Preferences -> Buffering)(off) - unchecked  
>&256=1, Disable media buffering for tracks that are selected(Preferences -> Buffering)(on) - checked  

>&512=0, Disable media buffering for tracks with open MIDI editors(recommended)(Preferences -> Buffering)(on) - checked  
>&512=1, Disable media buffering for tracks with open MIDI editors(recommended)(Preferences -> Buffering)(off) - unchecked  

>&1024=0, Allow anticipative FX processing when rendering (better multiprocessing)(on) - checked  
>&1024=1, Allow anticipative FX processing when rendering (better multiprocessing)(off) - unchecked  

>&2048=0, Rendering stems for full project via action(Preferences -> Rendering)(on) - checked  
>&2048=1, Rendering stems for full project via action(Preferences -> Rendering)(off) - unchecked  

>&4096=0, Process all tracks during stem render (some hardware-based plugins may need this)(Preferences -> Rendering)(off) - unchecked  
>&4096=1, Process all tracks during stem render (some hardware-based plugins may need this)(Preferences -> Rendering)(on) - checked  

>&8192=0, Rendering stems for time selection via action(Preferences -> Rendering)(off) - unchecked  
>&8192=1, Rendering stems for time selection via action(Preferences -> Rendering)(on) - checked  

>&65536=0, Freeze muted items into muted silent items -> unchecked
>&65536=1, Freeze muted items into muted silent items -> checked

Stored in reaper.ini under the same name in the section REAPER.  

Audio reading/processing threads-inputbox, as set in Preferences -> Buffering  
It is an integer, preferences variable.

>0, turns all buffering FX/processing and thread-priority off  
>1 to 2147483647; higher values become negative  

Stored in reaper.ini under the same name in the section REAPER.  

Denormalization and Security-Settings, as set in Preferences -> Compatibility  
This in an integer-bitfield, preferences variable.  

>&1=0, Reduce denormalization from plug-ins(recommended) - unchecked  
>&1=1, Reduce denormalization from plug-ins(recommended) - checked  

>&2=0, Terminate REAPER immediately if a plug-in corrupts the process heap - unchecked  
>&2=1, Terminate REAPER immediately if a plug-in corrupts the process heap(needs restart of Reaper to take effect) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

The VST bridging/firewall-dropdownlist, as set in Preferences -> Compatibility.  
It is an integer

>0, Automatic bridging (when required)  
>1, In separate plug-in process  
>2, In dedicated process per-plugin  
>3, Only native (disable bridging)  

Stored in reaper.ini under the same name in the section REAPER.  

Show icon for last track in folder, as set in the mixer-context-menu as well as TCP-context-menu -> Show TCP on right side of arrange
It is an integer-bitfield, tcp-context-menu variable.

Can be affected by the following actions:
  Mixer: Toggle show master track on right side
  Mixer: Toggle show icons for the last track in a folder
  Mixer: Clickable icon for folder tracks to show/hide children
  View: Toggle master track in separate/docked window
  Mixer: Toggle master track in docked window
  Mixer: Toggle master track in separate window
  View: Show TCP on right side of arrange

>&1=0, show icon for last track in folder(on) - checked  
>&1=1, show icon for last track in folder(off) - unchecked  

>&2=0, clickable icon for folder tracks to show/hide children(off) - unchecked  
>&2=1, clickable icon for folder tracks to show/hide children(on) - checked  

>&16=0, Master track -> Show in separate window(off) - unchecked  
>&16=1, Master track -> Show in separate window(on) - checked  

&16 is also for  

>&16=0, Master track -> Show in docker(off) - unchecked  
>&16=1, Master track -> Show in docker(on) - checked  

so you can really decide, which setting to use

>&32=0, show TCP on the left side of arrange-view
>&32=1, show TCP on the right side of arrange-view

Stored in reaper.ini under the same name in the section REAPER.  

Several entries, as set in the mixer-context-menu  
It is an integer-bitfield, mixer-context-menu variables.

Can be affected by the following actions:
  Mixer: Toggle show folder tracks in mixer
  Mixer: Toggle folder tracks grouping to left
  Mixer: Toggle show normal top level tracks in mixer
  Mixer: Toggle tracks with receives in mixer
  Mixer: Toggle tracks with receives grouping to left
  Mixer: Toggle show tracks in folders in mixer
  Mixer: Toggle autoarrange

>&1=0, Show normal top level tracks(off) - unchecked  
>&1=1, Show normal top level tracks(on) - checked  

>&2=0, Show folders(off) - unchecked  
>&2=1, Show folders(on) - checked  

>&4=0, Group folders to left(off) - unchecked  
>&4=1, Group folders to left(on) - checked  

>&8=0, Show tracks that have receives(off) - unchecked  
>&8=1, Show tracks that have receives(on) - checked  

>&16=0, Group tracks that have receives to left(off) - unchecked  
>&16=1, Group tracks that have receives to left(off) - checked  

>&32=0, Show tracks that are in folders(on) - checked  
>&32=1, Show tracks that are in folders(off) - unchecked  

>&64=0, Auto-arrange tracks in mixer(on) - checked  
>&64=1, Auto-arrange tracks in mixer(off) - unchecked  

Several settings, as set in the Project-tab-context-menu  
It is an integer-bitfield, project-tab-context-menu.

Can be affected by the following actions:
  Project tabs: Run background projects
  Project tabs: Auto-offline background project media
  Project tabs: Run stopped background projects
  Project tabs: Always show project tabs
  Project tabs: Hide all background project windows
  Project tabs: Play stopped background projects with active project
  Project tabs: Synchronize play start times w/ play background projects
  Project tabs: Show project tabs on left side of window
  Project tabs: Synchronize any parent projects when playing back subproject
  Project tabs: Defer rendering of subprojects (render on tab switch rather than save)
  Project tabs: Leave subproject open in tab after automatic open and render
  Project tabs: Force project tabs visible when monitoring FX in use
  Project tabs: Do not automatically render subprojects (require manual render)
  Project tabs: Prompt before automatic rerender of background subprojects

>&1=0, Run background projects(on) - checked  
>&1=1, Run background projects(off) - unchecked  

>&2=0, Run stopped background projects(off) - unchecked  
>&2=1, Run stopped background projects(needs &1 to be set to on)(on) - checked  

>&4=0, Offline background project media(off) - unchecked  
>&4=1, Offline background project media(on) - checked  

>&8=0, Always show project tabs(off) - unchecked  
>&8=1, Always show project tabs(on) - checked  

>&16=0, Hide background project FX/MIDI/ windows(on) - checked  
>&16=1, Hide background project FX/MIDI/ windows(off) - unchecked  

>&32=0, Play stopped background projects with active project(off) - unchecked  
>&32=1, Play stopped background projects with active project(needs &1 to be set to on)(on) - checked  

>&64=0, Synchronize play start times w/ play background projects(off) - unchecked  
>&64=1, Synchronize play start times w/ play background projects(on) - checked  

>&128=0, Show project tabs on left side of window(off) - unchecked  
>&128=1, Show project tabs on left side of window(on) - checked  

>&256=0, Synchronize any parent projects on playback(off) - unchecked  
>&256=1, Synchronize any parent projects on playback(needs &32 to be set to on)(on) - checked  

>&512=0, Subproject rendering -> Defer rendering of subprojects(render on tab switch rather on save)(off) - unchecked  
>&512=1, Subproject rendering -> Defer rendering of subprojects(render on tab switch rather on save)(on) - checked  

>&1024=0, Subproject rendering -> Leave subproject open in tab after automatic open and render(off) - unchecked  
>&1024=1, Subproject rendering -> Leave subproject open in tab after automatic open and render(on) - checked  

>&2048=0, Force project tabs visible when monitoring FX in use(on) - checked  
>&2048=1, Force project tabs visible when monitoring FX in use(off) - unchecked  

>&4096=0, Subproject rendering -> Do not autmatically render subprojects (require manual render)(off) - unchecked  
>&4096=1, Subproject rendering -> Do not autmatically render subprojects (require manual render)(on) - checked  

>&8192=0, Subproject rendering -> Prompt before automatic rerender of background projects(off) - unchecked  
>&8192=1, Subproject rendering -> Prompt before automatic rerender of background projects(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

The Control surface display update frequency in Hz, as set in the Preferences -> Control/OSC/web.  
It is an integer, preferences variable.
Default is 15  

>1 to 2147483647  
  
Stored in reaper.ini under the same name in the section REAPER.  

Audio thread priority-dropdownlist, as set in Preferences -> Device  
It is an integer, preferences variable.  

>-1, ASIO Default / MMCSS Pro Audio / Time Critical  
>0, Normal  
>1, Above normal  
>2, Highest  
>3, Time Critical  
>4, MMCSS / Time Critical  

Stored in reaper.ini under the same name in the section REAPER.  

Stretching razor edit area adds stretch markers to audio items-checkbox, as set in Preferences -> Editing Behavior  
It is an integer, preferences variable.

>0, checkbox is on
>1, checkbox is off

Stored in reaper.ini under the same name in the section REAPER.  

Several settings for item-clicks, as set in Preferences -> Mouse Modifiers as well as Preferences -> Editing Behavior
Only for Media item, Track Modifiers  
It is an integer-bitfield, preferences variable.

Can be affected by the following actions:
  Options: Move edit cursor to start of time selection, when time selection changes
  Options: Move edit cursor to end of recording, when recording ends

>&4=0, Move edit cursor to start of time selection on time selection change(Preferences->Editing Behavior)(off) - unchecked  
>&4=1, Move edit cursor to start of time selection on time selection change(Preferences->Editing Behavior)(on) - checked  

>&8=0, Move edit cursor when pasting/inserting media(Preferences->Editing Behavior)(on) - checked  
>&8=1, Move edit cursor when pasting/inserting media(Preferences->Editing Behavior)(off) - unchecked  

>&16=0, Move edit cursor to end of recorded items on record stop(Preferences->Editing Behavior)(off) - unchecked  
>&16=1, Move edit cursor to end of recorded items on record stop(Preferences->Editing Behavior)(on) - checked  

>&32=0, Clear loop points on click in ruler(Preferences->Editing Behavior)(off) - unchecked  
>&32=1, Clear loop points on click in ruler(Preferences->Editing Behavior)(on) - checked  

>&64=0, Clear time selection when edit cursor moves on click in arrange view(Preferences->Editing Behavior)(off) - unchecked  
>&64=1, Clear time selection when edit cursor moves on click in arrange view(Preferences->Editing Behavior)(on) - checked  

>&128=0, Automatically delete empty tracks created by dragging items below the last track and back(Preferences->Editing Behavior)(on) - checked  
>&128=1, Automatically delete empty tracks created by dragging items below the last track and back(Preferences->Editing Behavior)(off) - unchecked  

>&256=0, When drawn above media items, treat item label area the same as empty track space(on)(Preferences -> Mouse Modifiers) - checked  
>&256=1, When drawn above media items, treat item label area the same as empty track space(off)(Preferences -> Mouse Modifiers) - unchecked  

>&512=0, Move edit cursor on razor edit change -> unchecked
>&512=1, Move edit cursor on razor edit change -> checked

Stored in reaper.ini under the same name in the section REAPER.  

Locked item ripple editing behavior-dropdownlist, as set in Preferences -> Editing Behavior  
It is an integer, preferences variable.

>0, Locked items interrupt ripple  
>1, Locked items interrupt ripple per-track  
>2, Locked items are unaffected by ripple  
>3, Locked items are affected by ripple (lock ignored)  

Stored in reaper.ini under the same name in the section REAPER.  

Several checkboxes, as set in Transient Detection Settings located in the View-menu or Preferences -> Editing Behavior and in Preferences -> Editing Behavior -> Adjust sensitivity-Button  
It is an integer-bitfield, preferences variable.

>&1=0, Tab through MIDI notes(Preferences -> Editing Behavior)(off) - unchecked  
>&1=1, Tab through MIDI notes(Preferences -> Editing Behavior)(on) - checked  

>&2=0, Use zero crossings (not as precise but prevents clicks)(off) - unchecked  
>&2=1, Use zero crossings (not as precise but prevents clicks)(on) - checked  

>&4=0, Display threshold in media items while this window is open(off) - unchecked  
>&4=1, Display threshold in media items while this window is open(on) - checked  

>&8=0, Media items selection follows tab-to-transient(off) - unchecked  
>&8=1, Media items selection follows tab-to-transient(on) - checked  

>&16=0, Treat media item edges as transients(Preferences -> Editing Behavior)(off) - unchecked  
>&16=1, Treat media item edges as transients(Preferences -> Editing Behavior)(on) - checked  

>&32=0, Move by at least 1 pixel when navigating by transients(off) - unchecked  
>&32=1, Move by at least 1 pixel when navigating by transients(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Sensitivity-fader, as set in Transient Detection Settings located in View-menu or Preferences -> Editing Behavior -> Adjust sensitivity-Button  
It is a double-float, preferences variable.

>0.0(for displayed value 0%) to 1.0(for displayed valued 100%); default is 0.5(for displayed value 50%)  

Stored in reaper.ini under the same name in the section REAPER.  

Threshold-fader, as set in Transient Detection Settings located in the View-menu or Preferences -> Editing Behavior -> Adjust sensitivity-Button  
It is a double-float, preferences variable.

>-60 to 0; value is in dB; default is -17  

Stored in reaper.ini under the same name in the section REAPER.  

Loop points linked to time selection, as set in the Options-menu as well as in Preferences -> Editing Behavior  
It is an integer, preferences variable.

Can be affected by the following actions:
  Options: Toggle loop points linked to time selection

>0, disabled looping points to time selection  
>1, enabled looping points to time selection  

Stored in reaper.ini under the same name in the section REAPER.  

When adding envelopes or setting visible, set focus to the envelope, as set in Preferences -> Envelope Display  
It is an integer, preferences variable.

>0, don't set focus(off) - unchecked  
>1, set focus(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

When drawn over media, overlap envelopes if each line is less than-checkbox AND inputbox, as set in Preferences -> Envelope Display  
To check the checkbox, just make the value negative and minus -1  
It is an integer, preferences variable.

>0 to 2147483647, in pixels, When drawn over media, overlap envelopes if each line is less than-checkbox(off)  
>-1 to -2147483648, in pixels, When drawn over media, overlap envelopes if each line is less than-checkbox(on)  

Stored in reaper.ini under the same name in the section REAPER.  

Several settings from the Automation-section, as set in Preferences -> Automation as well as in Preferences -> Envelope Display as well as in menu Options -> Envelope points
It is an integer-bitfield, preferences variable.

Can be affected by the following actions:
  Options: Add edge points when moving envelope points with items
  Options: Add edge points when ripple editing or inserting time
  Options: Reduce envelope data when recording or drawing automation
  Options: Ripple edit all affects tempo map
  Options: Add edge points when moving multiple envelope points
  Options: Prevent mouse edits of single envelope points from moving past other envelope points

>&1=0, Reduce envelope point data when recording or drawing automation(off) - unchecked  
>&1=1, Reduce envelope point data when recording or drawing automation(on) - checked  

>&2=0, Add edge points when moving envelope points with items(off) - unchecked  
>&2=1, Add edge points when moving envelope points with items(on) - checked  

>&4=0, Add edge points when ripple editing or inserting time(Options -> Envelope points)(off) - unchecked  
>&4=1, Add edge points when ripple editing or inserting time(Options -> Envelope points)(on) - checked  

>&8 and &16, When recording automation and stopped-dropdownlist  
  >>0 0, Add additional point before edit position  
  >>0 1, Do not add additional points  
  >>1 0, Add points before and after edit position  

>&32=0, fader scaled volume envelopes-checkbox(Preferences -> Envelope Display)(on) - checked  
>&32=1, fader scaled volume envelopes-checkbox(Preferences -> Envelope Display)(off) - unchecked  

>&64=0, other envelopes(Preferences -> Envelope Display)(on) - checked  
>&64=1, other envelopes(Preferences -> Envelope Display)(off) - unchecked  

>&128=0, Ripple edit all affects tempo map(Ripple Edit Button-context menu from Main Toolbar)(off) - unchecked  
>&128=1, Ripple edit all affects tempo map(Ripple Edit Button-context menu from Main Toolbar)ri(on) - checked  

>&512=0, Add edge points when moving multiple envelope points(Options -> Envelope points)(off) - unchecked  
>&512=1, Add edge points when moving multiple envelope points(Options -> Envelope points)(on) - checked  

>&1024=0, Prevent mouse edits of single envelope points from moving past other envelope points(Preferences -> Envelope Display)(off) - unchecked  
>&1024=1, Prevent mouse edits of single envelope points from moving past other envelope points(Preferences -> Envelope Display)(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Several settings, as set in the menu Options -> Envelope points as well as in Preferences -> Envelope Display  
It is an integer-bitfield, preferences variable.  

>&8=0, First click on unselected envelope can insert point a point(depends on mouse modifier settings)(off) - unchecked  
>&8=1, First click on unselected envelope can insert point a point(depends on mouse modifier settings)(on) - checked  

>&64=0, Envelope point selection follows time selection for the active envelope(off) - unchecked  
>&64=1, Envelope point selection follows time selection for the active envelope(on) - checked  

>&128=0, Automatically show affected envelopes when moving media items across tracks(off) - unchecked  
>&128=1, Automatically show affected envelopes when moving media items across tracks(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Transition time for automatically created envelope edge points-inputbox, as set in Preferences -> Envelope Display  
It is a double-float, preferences variable.

>0.0001 and higher; unlike in the Preferences, this value is in seconds NOT milliseconds  

Stored in reaper.ini under the same name in the section REAPER.  

Per-take pitch envelope range-inputbox, as set in Preferences -> Envelope Display  
It is an integer, preferences variable.

>1 to 2147483647;  
>add 256 for 1 semitone-snap,  
>add 512 for 50 cent-snap,  
>add 768 for 25 cent-snap,  
>add 1024 for 10 cent-snap,  
>add 1280 for 5 cent-snap,  
>add 1537 for 1 cent-snap.  

Stored in reaper.ini under the same name in the section REAPER.  

Several settings from the Automation items-section, as set in Preferences -> Automation as well as in Preferences -> Envelope Display and in Preferences -> Mouse Modifiers(only Automation item and Automation item edge-Modifiers)  
It is an integer-bitfield, preferences variable.

Can be affected by the following actions:
  Options: Automation item baseline/amplitude edits affect pooled copies
  Options: Loop new automation items by default
  Options: Trim content behind automation items when editing or writing automation
  Options: Always create new automation items when writing automation
  Options: Automatically insert automation item when activating envelope that is bypassed outside of automation items and not displayed in envelope lane

>&1=0, Editing baseline/amplitude in properties dialog affects pooled copies(off) - unchecked  
>&1=1, Editing baseline/amplitude in properties dialog affects pooled copies(on) - checked  

>&2=0, Loop new automation items by default(on) - checked  
>&2=1, Loop new automation items by default(off) - unchecked  

>&4=0, Insert new automation item when writing automation and underlying envelope enabled(off) - unchecked  
>&4=1, Insert new automation item when writing automation and underlying envelope enabled(on) - checked  

>&16=0, Automatically append envelope name to automation item label(Preferences -> Envelope Display)(on) - checked  
>&16=1, Automatically append envelope name to automation item label(Preferences -> Envelope Display)(off) - unchecked  

>&32=0, Pool source data when pasting automation items(off) - unchecked  
>&32=1, Pool source data when pasting automation items(on) - checked  

>&64=0, When copying with media items(on) - checked  
>&64=1, When copying with media items(off) - unchecked  

>&128=0, Edits affect all pooled automation items at the same time position-checkbox(Preferences -> Mouse Modifiers)(off) - unchecked  
>&128=1, Edits affect all pooled automation items at the same time position-checkbox(Preferences -> Mouse Modifiers)(off) - checked  

>&256=0, Trim content behind automation items when editing or writing automation(off) - unchecked  
>&256=1, Trim content behind automation items when editing or writing automation(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Project tempo map envelope display max-inputbox, as set in Preferences -> Envelope Display  
It is an integer, preferences variable.

>2 to 2147483647; in bpm; must be bigger than config variable tempoenvmin

Stored in reaper.ini under the same name in the section REAPER.  

Project tempo map envelope display min-inputbox, as set in Preferences -> Envelope Display  
It is an integer, preferences variable.

>1 to 2147483647; in bpm  

Stored in reaper.ini under the same name in the section REAPER.  

Prevent editing fade-in/out when item is less than xx pixels tall-inputbox, as set in Preferences -> Fades/Crossfades  
It is an integer, preferences variable.

>0 to 2147483648; in pixels  

Stored in reaper.ini under the same name in the section REAPER.  

Prevent editing fade-in/out when item is less than xx pixels wide-inputbox, as set in Preferences -> Fades/Crossfades  
It is an integer, preferences variable.

>0 to 2147483648; in pixels  

Stored in reaper.ini under the same name in the section REAPER.  

Show fade-in/out handle ... pixels wide-inputbox, as set in Preferences -> Fades/Crossfades  
It is an integer, preferences variable.

>0 to 2147483647; in pixels  

Stored in reaper.ini under the same name in the section REAPER.  

Several settings for appearance of items, as set in Preferences -> Media as well as in Preferences -> Fades/Crossfades  
This is located in Preferences -> Appearance->Media, NOT Media!  
It is an integer-bitfield, preferences variable.

>&1=0, Locked(Preferences -> Media, section Media item buttons)(off) - unchecked  
>&1=1, Locked(Preferences -> Media, section Media item buttons)(on) - checked  

>&2=0, Not locked(Preferences -> Media, section Media item buttons)(off) - unchecked  
>&2=1, Not locked(Preferences -> Media, section Media item buttons)(on) - checked  

>&4=0, Per-take FX(Preferences -> Media, section Media item buttons)(off) - unchecked  
>&4=1, Per-take FX(Preferences -> Media, section Media item buttons)(on) - checked  

>&8=0, No FX(Preferences -> Media, section Media item buttons)(off) - unchecked  
>&8=1, No FX(Preferences -> Media, section Media item buttons)(on) - checked  

>&16=0, Muted(Preferences -> Media, section Media item buttons)(off) - unchecked  
>&16=1, Muted(Preferences -> Media, section Media item buttons)(on) - checked  

>&32=0, Not muted(Preferences -> Media, section Media item buttons)(off) - unchecked  
>&32=1, Not muted(Preferences -> Media, section Media item buttons)(on) - checked  
  
>&64=0, Notes(Preferences -> Media, section Media item buttons)(off) - unchecked  
>&64=1, Notes(Preferences -> Media, section Media item buttons)(on) - checked  

>&128=0, No notes(Preferences -> Media, section Media item buttons)(off) - unchecked  
>&128=1, No notes(Preferences -> Media, section Media item buttons)(on) - checked  

>&256=0, Grouped Items(Preferences -> Media, section Media item buttons)(off) - unchecked  
>&256=1, Grouped Items(Preferences -> Media, section Media item buttons)(on) - checked  
  
>&512 and &1024, Item take rate/pitch-radiobuttons(Preferences -> Media)  
      
  >> 0 0, Normal labels  
  >> 1 0, Abbreviate  
  >> 0 1, Numbers only  
  
>&2048 and &4096, Item Properties/Item properties only if resampled media(Preferences -> Media, section Media item buttons)  

  >> 1 0, Item Properties(on) - checked  
  >> 0 0, Item Properties only if resampled media(on) - checked  
  >> 0 1, Item Properties(off) and Item Properties only if resampled media(off) - unchecked  

>&8192=0, Pooled MIDI(Preferences -> Media, section Media item buttons)(on) - checked  
>&8192=1, Pooled MIDI(Preferences -> Media, section Media item buttons)(off) - unchecked  

>&16384=0, Item volume control-dropdownlist: Knob(on) - checked  
>&16384=1, Item volume control-dropdownlist: Knob(off) - unchecked  

>&32768 and &65536, Show fade-in/out handle-radiobuttons  

  >> 0 0, never  
  >> 0 1, always  
  >> 1 0, when fade is less than(see config variable itemfadehandle_maxwidth for the inputbox)  
  
>&131072=0, Show crossfade handle when media items are not aligned vertically-radiobutton  
>&131072=1, Show crossfade handle always-radiobutton  
  
>&262144=0, Automation envelopes(Preferences -> Media, section Media item buttons)(off) - checked  
>&262144=1, Automation envelopes(Preferences -> Media, section Media item buttons)(on) - unchecked  
  
>&524288=0, No active envelopes(Preferences -> Media, section Media item buttons)(off) - unchecked  
>&524288=1, No active envelopes(Preferences -> Media, section Media item buttons)(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Show recent actions-entry, as set in the Actions-menu and Preferences -> General as well as
some entries beind the context menu in Preferences -> General -> Recent project list display-button
It is an integer, global variable
  
>&1=0, don't show recent actions - unchecked  
>&1=1, show recent actions - checked  

>&2 &8, Display filename / path
   0  0, Display full path
   1  0, Display file name and full path
   1  1, Display file name

>&4=0, Display project title (as set in Project Settings / Notes) - unchecked
>&4=1, Display project title (as set in Project Settings / Notes) - checked

>&16=0, Add to recent list when loading projects - checked
>&16=1, Add to recent list when loading projects - unchecked

>&32=0, Remove old projects from recent list when using 'Save new version of project' - unchecked
>&32=1, Remove old projects from recent list when using 'Save new version of project' - checked

>&64=0, Add to recent list when using 'Save copy of project' - checked
>&64=1, Add to recent list when using 'Save copy of project' - unchecked

Stored in reaper.ini under the same name in the section REAPER.  

Allow keyboard commands even when mouse-editing-checkbox, as set in Preferences -> General ->Advanced UI/system tweaks  
It is an integer, preferences variable.  

>0, don't allow(off) - unchecked  
>1, allow(on) - checked  
  
Stored in reaper.ini under the same name in the section REAPER.  

Allow snap grid/track envelope/routing windows to stay open-checkbox in Preferences -> General -> Advanced UI/system tweaks.  
It is an integer, preferences variable.

>0, it is allowed(on) - checked  
>1, it is not allowed(off) - unchecked  
  
Stored in reaper.ini under the same name in the section REAPER.  

Use large (non-tool) window frames for windows-checkbox, as set in Preferences -> General -> Advanced UI/system tweaks-button  
It is an integer, preferences variable.

>0, don't use large window frames(off) - unchecked  
>1, use large window frames(on) - checked  
  
Stored in reaper.ini under the same name in the section REAPER.  

The Restrict REAPER to specific CPUs-inputbox, as set in Preferences -> General -> Advanced UI/system tweaks.  
It is an integer-bitfield, preferences variable.  

Every bit represents a given cpu. Set it to 1 and Reaper uses the cpu, set it to 0, Reaper will not use the cpu.  
There are 32 cpus supported (0 to 31)  

   >&0, allow cpu number 0  
   >&1, allow cpu number 1  
   >&2, allow cpu number 2  
    
   > ...  
   > ...  
   > ...  
      
   >&31, allow cpu number 31(31 sets cpuallowed to negative value !).  
  
For setting the checkbox, see config variable restrictcpu
  
          
Stored in reaper.ini under the same name in the section REAPER.  
  

Stores the "Open project(s) at startup"-dropdownlist-setting in the "Startup Settings"-section as set in Preferences -> General
It is an integer, preferences variable.  

>16, Last active project  
>17, Last project tabs  
>18, New project (ignore default template)  
>19, New project  
>20, Prompt  

Stored in reaper.ini under the same name in the section REAPER.  

The Maximum projects in recent project list, as set in the Preferences -> General  
Is an integer, preferences variable.

>0 to 100 projects

Stored in reaper.ini under the same name in the section REAPER.  

Several CPU-settings, as set in Preferences -> General -> Advanced UI/system tweaks.  
It is an integer-bitfield, preferences variable.

>&1=0, Restrict REAPER to specific CPUs(off) - unchecked  
>&1=1, Restrict REAPER to specific CPUs(on) - checked  

>&2=0, Do not allow the OS to relocate worker threads to different CPUs(off) - unchecked  
>&2=1, Do not allow the OS to relocate worker threads to different CPUs(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Stores the save-undo-states, as set in the Undo settings-section in the Preferences -> General as well as in Preferences -> Project  
It is an integer-bitfield, preferences variable.

>&1=0, Save undo history with project files (in .RPP-UNDO file) - unchecked  
>&1=1, Save undo history with project files (in .RPP-UNDO file) - checked  

>&2=0, Save undo history (RPP-UNDO)(if enabled in general prefs)(off) set in Preferences -> Backups - unchecked  
>&2=1, Save undo history (RPP-UNDO)(if enabled in general prefs)(on) set in Preferences -> Backups - checked  
  
>&4=0, Allow load of undo history - checked  
>&4=1, Allow load of undo history - unchecked  

>&8=0, Keep undo histories(Preferences -> Project - autosave settings)(off) - unchecked  
>&8=1, Keep undo histories(Preferences -> Project - autosave settings)(on) - checked  

>&16=0, Timestamp backup(Preferences -> Project - autosave settings)(off) - unchecked  
>&16=1, Timestamp backup(Preferences -> Project - autosave settings)(on) - checked  

>&256=0, Store multiple redo paths when possible (can use a lot of RAM) - unchecked  
>&256=1, Store multiple redo paths when possible (can use a lot of RAM) - unchecked  

>&512=0, Preserve all previously-saved versionso of project in one (large) .rpp-bak(Preferences -> Project - Backups)(either &512=1 or &16=1!)(off) - unchecked  
>&512=1, Preserve all previously-saved versionso of project in one (large) .rpp-bak(Preferences -> Project - Backups)(either &512=1 or &16=1!)(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

The ui-scaling of Reaper's UI, as set in Preferences->General->Advanced UI/system tweaks-dialog.  
Setting this variable has only an effect, when the "Scale UI elements of track/mixer panels, transport, etc, by-checkbox is checked(usually, when the scaling-value in the inputfield is something else than 1.00).  
It is a double, preferences variable.

>0.3-3, the scaling value; other values are also supported(0, turns off tabs)

Stored in reaper.ini under the same name in the section REAPER.

The "Include Selection" in the "Undo settings"-section, as set in Preferences -> General  
Is an integer-bitfield, preferences variable.

>&1=0, item not included  
>&1=1, item is included  

>&2=0, time not included  
>&2=1, time is included  

>&4=0, When approaching full undo memory, keep newest state -> deselected  
>&4=1, When approaching full undo memory, keep newest state -> selected  

>&8=0, cursor position is not included  
>&8=1, cursor position is included  

>&16=0, track not included  
>&16=1, track is included  

>&32=0, envelope point not included  
>&32=1, envelope point included  

Stored in reaper.ini under the same name in the section REAPER, BUT stores the value differently! Maybe because it's combined with another variable?  

The "Maximum undo memory use" in MB as set in the Preferences -> General.  
It is an integer, preferences variable.

>0 to 2147483647; higher values lead to negative values.  

Stored in reaper.ini under the same name in the section REAPER.  

The "Automatically check for new versions of REAPER on startup"-checkbox in the "Startup Settings"-section as set in Preferences -> General.  
Is an integer, preferences variable.

>0, don't check for new versions - unchecked  
>1, check for new versions - checked  

Stored in reaper.ini under the same name in the section REAPER.  

The "warn when REAPER's memory reaches x megabytes (0 to never warn)"-checkbox, as set in Preferences -> General  
Is an integer, preferences variable.

>0, never warn  
>1 to 2147483647; in megabytes; higher values become negative values  
  
Stored in reaper.ini under the same name in the section REAPER.  

It is the Modal window positioning-dropdownlist, as set in Preferences -> General -> Advanced UI/system tweaks  
It is an integer, preferences variable.

  >0, Last window position (default)  
  >1, Center on current screen  
  >2, Center on mouse cursor  
  >3, OS positioning  

Stored in reaper.ini under the same name in the section REAPER.  

The Set process working set size-minimum inputbox, as set in Reaper -> General -> Advanced UI/system tweaks  
It is an integer value, preferences variable.

>0 to 2147483647; higher values become negative  

Stored in reaper.ini under the same name in the section REAPER.  

The Set process working set size-minimum inputbox, as set in Reaper -> General -> Advanced UI/system tweaks  
It is an integer value, preferences variable.

>0 to 2147483647; higher values become negative  

Stored in reaper.ini under the same name in the section REAPER.  

Set process working set size-checkbox, as set in Reaper -> General -> Advanced UI/system tweaks  
It is an integer, preferences variable.

>0, no process working set size(off) - unchecked  
>1, process working set size(on) - checked  
  
Stored in reaper.ini under the same name in the section REAPER.  

Create automatic fade-in/fade-out for new items, length-inputbox, as set in Preferences -> Item Fade Defaults
It is a double-float, preferences variable.  

>Fadelength in seconds; negative values are allowed.  

Stored in reaper.ini under the same name in the section REAPER.  

The Default fade-in/fade-out-shape-button, as set in Preferences -> Item Fade Defaults
It is an integer, preferences variable.

>0 to 6, the individual shapes selectable through the button.  

Stored in reaper.ini under the same name in the section REAPER.  

Overlap and crossfade items when splitting length-inputbox, as set in Preferences -> Item Fade Defaults  
It is a double-float, preferences variable.

>overlap/crossfade-length in seconds; negative values are allowed.  

Stored in reaper.ini under the same name in the section REAPER.  

The Default crossfade-shape-button, as set in Preferences -> Item Fade Defaults
It is an integer, preferences variable.

>0 to 6, the individual shapes selectable through the button.  

Stored in reaper.ini under the same name in the section REAPER.  

Several checkboxes, as set in Preferences -> Media Item Defaults as well as Preferences -> Item Fade Defaults
&1 can be influenced by defenvs(&32768) as well!  
It is an integer-bitfield, preferences variable.

Can be affected by the following actions:
  Options: Toggle auto-crossfade on split
  Item: Toggle enable/disable default fadein/fadeout

Can be affected by the following actions:
  Options: Toggle auto-crossfade on/off
  Options: Loop recording always adds takes to newly recorded items (except in track free item positioning mode)
  Options: Toggle auto-crossfade on split
  Options: Toggle trim content behind media items when editing
  Item: Toggle enable/disable default fadein/fadeout
  Options: New recording creates new media items in separate lanes (layers)
  Options: New recording splits existing items and creates new takes (default)
  Options: Always trim content behind razor edits (otherwise, follow media item editing preferences)
  Options: Toggle auto-crossfade on/off

>&1 &512, Split media items-dropdownlist
  >>0 0, No crossfade
  >>1 0, Overlap and crossfade
  >>0 1, Respect toolbar auto-crossfade button

>&2=0, Apply fade-in/fade-out/crossfade preferences to MIDI items - unchecked  
>&2=1, Apply fade-in/fade-out/crossfade preferences to MIDI items - checked  

>&4=0, Crossfades stay together during fade edits when trim content behind media items is enabled(Preferences -> Editing Behavior)(off) - unchecked  
>&4=1, Crossfades stay together during fade edits when trim content behind media items is enabled(Preferences -> Editing Behavior)(on) - checked  

>&8=0, Split media items-Fade In/fade-out-checkbox - checked  
>&8=1, Split media items-Fade In/fade-out-checkbox - unchecked  

>&16=0, Right click on crossfade sets fade shape for only one side of the crossfade(shift toggles)(off) - unchecked  
>&16=1, Right click on crossfade sets fade shape for only one side of the crossfade(shift toggles)(on) - checked  

>&32 &65536, Imported media items-checkbox
    1 0, checkbox unchecked
    0 1, checkbox checked
    
>&64 &32768, 'Trim contents behind razor edits' enabled-dropdownlist
    >>0 0, No crossfade
    >>1 0, Overlap and crossfade
    >>0 1, Respect toolbar auto-crossfade button

>&128=0, Fixed lane comp areas-Fade In/fade-out-checkbox - checked
>&128=1, Fixed lane comp areas-Fade In/fade-out-checkbox - unchecked

>&256=0, Limit split-created fade/crossfade to-checkbox(Preferences -> Item Fade Defaults) - unchecked
>&256=1, Limit split-created fade/crossfade to-checkbox(Preferences -> Item Fade Defaults) - checked

>&1024 &2048, Recorded media items-dropdownlist
    >>0 0, No crossfade
    >>1 0, Overlap and crossfade
    >>0 1, Respect toolbar auto-crossfade button

>&4096 &8192, 'Trim contents behind media edits' enabled-dropdownlist
    >>0 1, No crossfade
    >>1 0, Overlap and crossfade
    >>0 0, Respect toolbar auto-crossfade button

>&16384=0, Recorded media items-checkbox - checked
>&16384=1, Recorded media items-checkbox - unchecked

Stored in reaper.ini under the same name in the section REAPER.  

Limit split-created fade/crosfade to-inputbox, as set in Preferences -> Item Fade Defaults
It is an integer, preferences variable.

>0 to 999999 pixels; default is 50

Stored in reaper.ini under the same name in the section REAPER.  

Default stretch marker fade size for new items-inputbox, as set in Preferences -> Item Fade Defaults
It is a double-float, preferences variable.

>in seconds

Stored in reaper.ini under the same name in the section REAPER.  

Loop-checkboxes, as set in Preferences -> Item Loop Defaults  
It is an integer-bitfield, preferences variable.

>&2=0, MIDI items-checkbox - unchecked  
>&2=1, MIDI items-checkbox - checked  

>&4=0, Imported items-checkbox - unchecked  
>&4=1, Imported items-checkbox - checked  

>&8=0, Recorded items-checkbox - checked  
>&8=1, Recorded items-checkbox - unchecked  

>&16=0, Time selection auto-punch audio recording creates loopable section-checkbox - unchecked  
>&16=1, Time selection auto-punch audio recording creates loopable section-checkbox - checked  

>&32=0, Glued items-checkbox - checked  
>&32=1, Glued items-checkbox - unchecked  

Stored in reaper.ini under the same name in the section REAPER.  

Timeout for momentary keyboard sections override-inputbox, as set in Preferences -> Keyboard/Multitouch
It is an integer, preferences variable.

  >1-2147483647 ms

Stored in reaper.ini under the same name in the section REAPER.  

Some keyboard-settings, as set in Preferences -> Keyboard/Multitouch  
It is an integer-bitfield, preferences variable.

Can be affected by the following actions:
  I/O dialog: Close window on enter key

>&1=0, Use alternate keyboard section when recording(off) - unchecked  
>&1=1, Use alternate keyboard section when recording(on) - checked  
  
>&2=0, Commit changes to some edit fields after 1 second of no typing(on) - checked  
>&2=1, Commit changes to some edit fields after 1 second of no typing(off) - unchecked  

Stored in reaper.ini under the same name in the section REAPER.  

Several settings from the Multitouch-section, as set in Preferences -> Keyboard/Multitouch.  
It is an integer-bitfield, preferences variable.

>&1=0, Enable multitouch swipe(off) - unchecked  
>&1=1, Enable multitouch swipe(on) - checked  

>&2=0, Enable multitouch zoom(off) - unchecked  
>&2=1, Enable multitouch zoom(on) - checked  

>&4=0, Enable multitouch rotate(off) - unchecked  
>&4=1, Enable multitouch rotate(on) - checked  

>&8=0, Suppress inertia (multitouch swipe, when &1=1)(on) - checked  
>&8=1, Suppress inertia (multitouch swipe, when &1=1)(off) - unchecked  

>&16=0, Suppress inertia (multitouch zoom, when &2=1)(on) - checked  
>&16=1, Suppress inertia (multitouch zoom, when &2=1)(off) - unchecked  

>&32=0, Suppress inertia (multitouch rotate, when &4=1)(on) - checked  
>&32=1, Suppress inertia (multitouch rotate, when &4=1)(off) - unchecked  

>&64=0, Reverse (multitouch swipe, when &1=1)(off) - unchecked  
>&64=1, Reverse (multitouch swipe, when &1=1)(on) - checked  

>&128=0, Reverse (multitouch zoom, when &2=1)(off) - unchecked  
>&128=1, Reverse (multitouch zoom, when &2=1)(on) - checked  

>&256=0, Reverse (multitouch rotate, when &4=1)(off) - unchecked  
>&256=1, Reverse (multitouch rotate, when &4=1)(on) - checked  

>&512=0, Reverse vertical scroll(off) - unchecked  
>&512=1, Reverse vertical scroll(on) - checked  

>&1024=0, Reverse horizontal scroll(off) - unchecked  
>&1024=1, Reverse horizontal scroll(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

The Ignore new gesture after multitouch gesture-inputbox in the multitouch-section, as set in Preferences -> Keyboard/Multitouch  
It is an integer, preferences variable.

>0 to 2147483647; in milliseconds  

Stored in reaper.ini under the same name in the section REAPER.  

The Ignore scroll after multitouch gesture-inputbox in the multitouch-section, as set in Preferences -> Keyboard/Multitouch  
It is an integer, preferences variable.

>0 to 2147483647; in milliseconds  

Stored in reaper.ini under the same name in the section REAPER.  

The Gearing-input box for Multitouch rotate in the Multitouch-section, as set in Preferences -> Keyboard/Multitouch  
It is a double-float, preferences variable.

>1.0 to 1e+255(a number with 255 times the 9)  

Stored in reaper.ini under the same name in the section REAPER.  

The Gearing-input box for Multitouch swipe in the Multitouch-section, as set in Preferences -> Keyboard/Multitouch  
It is a double-float, preferences variable.

>1.0 to 1e+255(a number with 255 times the 9)  

Stored in reaper.ini under the same name in the section REAPER.  

The Gearing-input box for Multitouch zoom in the Multitouch-section, as set in Preferences -> Keyboard/Multitouch  
It is a double-float, preferences variable.

>1.0 to 1e+255(a number with 255 times the 9)  

Stored in reaper.ini under the same name in the section REAPER.

LV2-plugin names-checkbox, as set in Preferences -> LV2  
It is an integer, preferences variable.

>&1=0, Append (Mono) for plug-ins with single input/output - unchecked
>&1=1, Append (Mono) for plug-ins with single input/output - checked

>&2=0, Append (Xch) for plug-ins with non-stereo I/O - unchecked
>&2=1, Append (Xch) for plug-ins with non-stereo I/O - checked

>&4=0, Append (Maintainer name) - unchecked
>&4=1, Append (Maintainer name) - checked

>&8=0, Append (MIDI) for plug-ins with no audio I/O - unchecked
>&8=1, Append (MIDI) - checked          
          
Stored in reaper.ini under the same name in the section REAPER.  

All settings, as set in Preferences -> Loop Recording  
It is an integer-bitfield, preferences variable.

>When recording and looped, add recorded media to project-radiobuttons  
   &1=0, On stop(default, recommended)-radiobutton  
   &1=1, At each loop (creates new files, good for recording multiple audio layers on the fly etc)  

>&2=0, Create new files on loop-checkbox(off) - unchecked  
>&2=1, Create new files on loop-checkbox(on) - checked  

>&4=0, In loop recording, discard incomplete first or last takes if at least one full loop was recorded(off) - unchecked  
>&4=1, In loop recording, discard incomplete first or last takes if at least one full loop was recorded(on) - checked  

>&8=0, MIDI overdub/replace recording always creates selection-length media item(off) - unchecked  
>&8=1, MIDI overdub/replace recording always creates selection-length media item(on) - checked  

>&256, &512, &1024, &2048, &4096, &8192, &16384 contain the percentage-value for Threshold for complete take.  

  >> 0 0 0 0 0 0 0; 0%  
  >> 1 0 0 0 0 0 0; 1%  
  >> 0 1 0 0 0 0 0; 2%  
  >> 1 1 0 0 0 0 0; 3%  
  >> 0 0 1 0 0 0 0; 4%  
  >>     ...  
  >> 0 1 0 0 1 1 0; 50%  
  >>     ...  
  >> 0 0 1 0 0 1 1; 100%  
    
          
Stored in reaper.ini under the same name in the section REAPER.  

The number of MIDI-inserts currently available, as set in Preferences -> MIDI Devices -> MIDI inputs to make available -> contextmenu -> Enable Input/Input ID
Seems to be set like config variable midiins_cs, with the only difference being, that you need to check the "Enable input"-menuentry.
It is an integer, preferences variable.

>0(no MIDI-input) and higher

Stored in reaper.ini under the same name in the section REAPER.  

The number of MIDI-inputs for CC-control messages currently available, as set in Preferences -> MIDI Devices -> MIDI inputs to make available -> contextmenu
Seems to be set like config variable midiins, with the only difference being, that you need to check the "Enable input for control messages"-menuentry.
It is an integer, preferences variable.

>0(no MIDI-input for CC-control messages) and higher

Stored in reaper.ini under the same name in the section REAPER.  

The context-menu of the MIDI outputs to make available-section, as set in Preferences -> MIDI Devices  
Doubleclick on a device in the list.  
It is an integer, preferences variable.

>0, Enable output(off) - unchecked  
>1, Enable output(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.

The Send clock to output-contextmenu-entry as set in Preferences->MIDI Devices->MIDI output-devices->rightlick on the midi-devices
It is a string, preferences variable.

This string works like an integer-bitfield, means, you need to convert it to integer.
After that, each bit(1 through n) represents a MIDI-output-device. If the bit is set to 1, the "Send clock to output-contextmenu-entry"-option for this device is set to on, otherwise to off.

Stored in reaper.ini under the same name in the section REAPER.      

The Do not send SPP to output-contextmenu-entry as set in Preferences->MIDI Devices->MIDI output-devices->rightlick on the midi-devices
It is a string, preferences variable.

This string works like an integer-bitfield, means, you need to convert it to integer.
After that, each bit(1 through n) represents a MIDI-output-device. If the bit is set to 1, the "Do not send SPP to output"-option for this device is set to on, otherwise to off.

Stored in reaper.ini under the same name in the section REAPER.      

The Low latency mode(low precision)-contextmenu-entry as set in Preferences->MIDI Devices->MIDI output-devices->rightlick on the midi-devices
It is a string, preferences variable.

This string works like an integer-bitfield, means, you need to convert it to integer.
After that, each bit(1 through n) represents a MIDI-output-device. If the bit is set to 1, the "Low latency mode(low precision)"-option for this device is set to on, otherwise to off.

Stored in reaper.ini under the same name in the section REAPER.

The Do not send reset messages-contextmenu-entry as set in Preferences->MIDI Devices->MIDI output-devices->rightlick on the midi-devices
It is a string, preferences variable.

This string works like an integer-bitfield, means, you need to convert it to integer.
After that, each bit(1 through n) represents a MIDI-output-device. If the bit is set to 1, the "Do not send reset messages"-option for this device is set to on, otherwise to off.

Stored in reaper.ini under the same name in the section REAPER.    

Restrict MIDI hardware output to one thread-checkbox, as set in Preferences -> MIDI Devices  
It is an integer, preferences variable.

>0, don't restrict(off) - unchecked  
>1, restrict(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.      

The Reset by/Reset on-checkboxes, as set in Preferences -> MIDI Devices as well as in section Playback settings in Preferences -> Playback  
It is an integer-bitfield

>&1=0, All-notes-off(on) - checked  
>&1=1, All-notes-off(off) - unchecked  

>&2=0, Pitch/sustain(on) - checked  
>&2=1, Pitch/sustain(off) - unchecked  

>&8=0, Send MIDI note-offs when un-record-arming a track(Preferences -> Playback)(on) - checked  
>&8=1, Send MIDI note-offs when un-record-arming a track(Preferences -> Playback)(off) - unchecked  

>&16=0, Reset MIDI CC/pitch on: playback start(Preferences -> Playback)(on) - checked  
>&16=1, Reset MIDI CC/pitch on: playback start(Preferences -> Playback)(off) - unchecked  

>&32=0, Reset MIDI CC/pitch on: playback stop(Preferences -> Playback)(off) - unchecked  
>&32=1, Reset MIDI CC/pitch on: playback stop(Preferences -> Playback)(on) - checked  

>&64=0, Play(on) - checked  
>&64=1, Play(off) - unchecked  

>&128=0, Stop/stopped seek(off) - unchecked  
>&128=1, Stop/stopped seek(on) - checked  

>&256=0, Reset MIDI CC/pitch on: playback loop/skip(on) - checked  
>&256=1, Reset MIDI CC/pitch on: playback loop/skip(off) - unchecked  

Stored in reaper.ini under the same name in the section REAPER.      

Events per quarter note when drawing in CC lines-inputbox, as set in Preferences -> MIDI Editor  
It is an integer, preferences variable.
The zoom-dependent-checkbox is signalled with a negative version of this value!  

>0 to 2147483647; higher values become negative; default is 32  

Stored in reaper.ini under the same name in the section REAPER.  

Events per quarter note when drawing in CC lines-inputbox, as set in Preferences -> MIDI Editor  
It is an integer, preferences variable.
The zoom-dependent-checkbox is signalled with a negative version of this value!  

>0 to 2147483647; higher values become negative; default is 32  

Stored in reaper.ini under the same name in the section REAPER.  

The Default shape for CC segments-dropdownlist, as set in Preferences -> MIDI Editor
It is an integer, preferences variable.
          
>0, Square
>1, Linear
>2, Slow start/end
>3, Fast start
>4, Fast end
>5, Bezier

Stored in reaper.ini under the same name in the section REAPER.  

The Playback interpolation-inputbox, as set in Preferences -> MIDI Editor
It is an integer, preferences variable.
          
>0 to 2147483647 in ppq

Stored in reaper.ini under the same name in the section REAPER.  

Default note color map-inputbox, as set in the Preferences -> MIDI Editor  
It is a string, preferences variable.
          
Stored in reaper.ini under the same name in the section REAPER.  

Several editor-settings, as set in Preferences -> MIDI Editor as well as in the menu of MIDI Editor -> Contents -> Behavior for "open items in built-in MIDI Editor" and some actions
It is an integer-bitfield, preferences variable.

>&1 and &2, One MIDI editor per  

  >> 0 0, media item  
  >> 0 1, track  
  >> 1 0, project  
  
>&4 and &16, Behavior for "open items in built-in MIDI editor  

  >> 1 1, Open the clicked MIDI item only  
  >> 0 0, Open all selected MIDI items  
  >> 0 1, Open all MIDI on the same track  
  >> 1 0, Open all MIDI in the project  

>&32=0, Close editor when the active item is deleted in the arrange view(on) - checked  
>&32=1, Close editor when the active item is deleted in the arrange view(off) - unchecked  

>&128=0, Active MIDI item follows selection changes in arrange view(on) - checked  
>&128=1, Active MIDI item follows selection changes in arrange view(off) - unchecked  

>&256=0, Only MIDI items on the same track as the active item are editable(on) - checked  
>&256=1, Only MIDI items on the same track as the active item are editable(off) - unchecked  

>&512=0, Selection is linked to editability(also MIDI-Editor-action 40891)(on) - checked  
>&512=1, Selection is linked to editability(also MIDI-Editor-action 40891)(off) - unchecked  

>&1024=0, Media item selection is linked to visibility(on) - checked  
>&1024=1, Media item selection is linked to visibility(off) - unchecked  

>&2048=0, All media items are editable in notation view(MIDI Editor -> Contents -> Behavior for "open items in built-in MIDI Editor")(on) - checked  
>&2048=1, All media items are editable in notation view(MIDI Editor -> Contents -> Behavior for "open items in built-in MIDI Editor")(off) - unchecked  

>&4096=0, Make secondary items editable by default(off) - unchecked  
>&4096=1, Make secondary items editable by default(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Several editor-settings, as set in Preferences -> MIDI Editor, Preferences -> Track Control Panels section VU meters, as well as in Options of the MIDI Editor itself and some actions.
It is an integer-bitfield, preferences variable.

>&1=0, Show MIDI velocity on track VU(Preferences -> Track Control Panels, section VU meters)(on) - checked  
>&1=1, Show MIDI velocity on track VU(Preferences -> Track Control Panels, section VU meters)(off) - unchecked  

>&2=0, Show MIDI output activity on track VU(Preferences -> Track Control Panels, section VU meters)(on) - checked  
>&2=1, Show MIDI output activity on track VU(Preferences -> Track Control Panels, section VU meters)(off) - unchecked  
  
>&4=0, Flash MIDI editor keys on track input(off) - unchecked  
>&4=1, Flash MIDI editor keys on track input(on) - checked  

>&8=0, Horizontal grid lines in CC lanes(off) - unchecked  
>&8=1, Horizontal grid lines in CC lanes(on) - checked  
  
>&256=0, Double-click outside the bounds of any media item to extend the nearest media item(off) - unchecked  
>&256=1, Double-click outside the bounds of any media item to extend the nearest media item(on) - checked  

>&2048 and &4096, Opacity (1-3) for notes/CC in secondary media items  

  >> 1 0, 1 opacity  
  >> 0 0, 2 opacity  
  >> 0 1, 3 opacity  

>&8192=0, Display 14-bit MSB/LSB CC data as a single entry in event list/properties(MIDI Editor -> Options)(on) - checked  
>&8192=1, Display 14-bit MSB/LSB CC data as a single entry in event list/properties(MIDI Editor -> Options)(off) - unchecked  
  
>&16384=0, Options: Enable extending parent media item when editing MIDI notes (if parent item is exactly the length of the MIDI content)(MIDIEditor-action: 40817) - off
>&16384=1, Options: Enable extending parent media item when editing MIDI notes (if parent item is exactly the length of the MIDI content)(MIDIEditor-action: 40817) - on
  
>&32768=0, Show tooltips in MIDI track list-contextmenu-entry in MIDI-Editor track list - checked
>&32768=1, Show tooltips in MIDI track list-contextmenu-entry in MIDI-Editor track list - unchecked

Stored in reaper.ini under the same name in the section REAPER.  

MIDI CC touch-replace recording timeout-inputbox, as set in the Preferences -> MIDI Settings  
It is an integer, preferences variable.
          
>0 to 2147483647;in milliseconds  
>The highest one that can be entered into the inputfield is 4294967295, which is -1 in the configvar!  

Stored in reaper.ini under the same name in the section REAPER.  

Some MIDI-settings, as set in Preferences -> MIDI settings as well in the Transport-context-menu as well as in MIDI Editor -> Options  
It is an integer-bitfield, preferences variable.

Can be affected by the following actions:
  Options: Chase MIDI note-ons in project playback

>&1=0, RBN-friendly MIDI editor settings(Preferences -> MIDI editor)(on) - unchecked  
>&1=1, RBN-friendly MIDI editor settings(Preferences -> MIDI editor)(off) - checked  

>&8=0, Snap time signature change events to whole bars when importing MIDI files - checked  
>&8=1, Snap time signature change events to whole bars when importing MIDI files - unchecked  

>&16=0, Snap tempo change events to whole beats when importing MIDI files - unchecked  
>&16=1, Snap tempo change events to whole beats when importing MIDI files - checked  

>&4 and &32, Character set for exported .MID text events  

  >> 0 0, Latin-1  
  >> 1 0, UTF-8  
  >> 0 1, ASCII (7-bit)  

>&128=0, Chase MIDI note-ons in project playback(also in MIDI Editor -> Options)(on) - checked  
>&128=1, Chase MIDI note-ons in project playback(also in MIDI Editor -> Options)(off) - unchecked  

Stored in reaper.ini under the same name in the section REAPER.  

MIDI octave name display offset-inputbox, as set in Preferences -> MIDI  
It is an integer, preferences variable.

>0 to 2147483646; higher values become negative; 0 based, means 0=1 octaves, 1=2 octaves, 2=3 octaves, etc  

Stored in reaper.ini under the same name in the section REAPER.  

Ticks per quarter note for new MIDI items-inputbox, as set in Preferences -> MIDI  
It is an integer

>1 to 2147483647; default 960  

Stored in reaper.ini under the same name in the section REAPER.  

Opening Midi-file-settings as well as some opening Media Items-settings, as set in Preferences -> MIDI and Preferences -> Media or the Consolidate Tracks-dialog.  
This is not(!) located in Preferences -> Appearance-Media!  
It is an integer, preferences variable.

>&1=0, Prompt to confirm filename on "open copy in editor" - unchecked  
>&1=1, Prompt to confirm filename on "open copy in editor" - checked  

>&2=0, Prompt to confirm filename on "insert new MIDI item" - unchecked  
>&2=1, Prompt to confirm filename on "insert new MIDI item" - checked  
  
>&4, Create new MIDI items as:  

  >> 0, MIDI items (in project, recommended) - radio button selected  
  >> 1, .MID files - radio button selected  
    
>&8, Import existing MIDI files as  

  >> 0, MIDI items (in project, recommended) - radio button selected  
  >> 1, .MID file reference - radio button selected  
    
>&16 and &32, Import multichannel MIDI files-dropdownlist  

  >> 0 0, As a multichannel item on a single track  
  >> 1 0, As single-channel items on multiple tracks  
  >> 0 1, Always prompt when importing multichannel MIDI  
    
>&64=0, Export MIDI as: reference in .RPP-file(for export to REAPER only)(Consolidate Tracks)  
>&64=1, Export MIDI as: .MID file(Consolidate Tracks)  

>&256=0, Always prompt to import tempo from MIDI files with simple tempo maps (holding ctrl toggles) - unchecked  
>&256=1, Always prompt to import tempo from MIDI files with simple tempo maps (holding ctrl toggles) - checked  

>&512=0, Handle type 0 MIDI files containing meta-events as if they were multichannel MIDI files - unchecked  
>&512=1, Handle type 0 MIDI files containing meta-events as if they were multichannel MIDI files - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Several MIDI-settings, as set in Preferences -> MIDI  
It is an integer-bitfield, preferences variable.

>&1=0, Allow trim of MIDI items when splitting (does not apply to pooled MIDI) - unchecked  
>&1=1, Allow trim of MIDI items when splitting (does not apply to pooled MIDI) - checked  

>&2=0, Pool MIDI source data when pasting or duplicating media items - unchecked  
>&2=1, Pool MIDI source data when pasting or duplicating media items - checked  

>&4, Create new MIDI items as:  

  >> 0, MIDI items (in project, recommended) - radio button selected  
  >> 1, .MID files - radio button selected  

Stored in reaper.ini under the same name in the section REAPER.  

Collapse free item positioning when track height is less than-inputbox, as set in Preferences -> Media Item Positioning
It is an integer, preferences variable.

  >0 to 2147483647; in pixels
  
Stored in reaper.ini under the same name in the section REAPER.  

Some peak-settings, as set in the Waveform media peak caching settings in Preferences -> Media, as well as in Preferences -> Paths.  
This is not(!) located in Preferences -> Appearance-Media!  
It is an integer-bitfield, preferences variable.

>&1=0, Store all peak caches (.reapeaks) in alternate path(Preferences -> Path)(off) - unchecked  
>&1=1, Store all peak caches (.reapeaks) in alternate path(Preferences -> Path)(on) - checked  

>&2=0, Store peak caches in alternate path if unable to write to media file directory - checked  
>&2=1, Store peak caches in alternate path if unable to write to media file directory - unchecked  
  
>&4=0, Put new peak files in peaks/ subfolder relative to media - unchecked  
>&4=1, Put new peak files in peaks/ subfolder relative to media - checked                            
          
Stored in reaper.ini under the same name in the section REAPER.  

When importing multiple media items-dropdownlist, as set in the Preferences -> Media  
This is not(!) located in Preferences -> Appearance-Media!  
It is an integer, preferences variable.

>0, Insert in one track (advancing time)  
>1, Insert across tracks  
>2, Decide automatically (by looking at lengths)  
>3, Prompt user  

Stored in reaper.ini under the same name in the section REAPER.  

Take FX tail length in milliseconds, as set in Preferences -> Media  
This is not(!) located in Preferences -> Appearance-Media!  
It is an integer, preferences variable.

>0 to 2147483647; higher values become negative  

Stored in reaper.ini under the same name in the section REAPER.  

Hide buttons when take lane is less than-inputbox, as set in Preferences -> Media
It is an integer, preferences variable.

>0 to 2147483647; in pixels  

Stored in reaper.ini under the same name in the section REAPER.      

Hide labels when media item height is less than-inputbox, as set in Preferences -> Media  
This is not(!) located in Preferences -> Appearance-Media!  
It is an integer, preferences variable.

>0 to 2147483647; in pixels  

Stored in reaper.ini under the same name in the section REAPER.  

Hide buttons when take height is less than-inputbox, as set in Preferences -> Media  
This is not(!) located in Preferences -> Appearance-Media!  
It is an integer, preferences variable.

>0 to 2147483647; in pixels  

Stored in reaper.ini under the same name in the section REAPER.  

Several settings, as set in Preferences -> Media as well as toggle actions 40258.  
This is not(!) located in Preferences -> Appearance-Media!  
It is an integer-bitfield, preferences variable.

Can be affected by the following actions:
  View: Toggle displaying labels above/within media items

>&1=0, Display media item take name(off) - unchecked  
>&1=1, Display media item take name(on) - checked  

>&2=0, Show labels for items when item edges are not visible(off) - unchecked  
>&2=1, Show labels for items when item edges are not visible(on) - checked  

>&4=0, Display media item pitch/playrate if set(off) - unchecked  
>&4=1, Display media item pitch/playrate if set(on) - checked  

>&8=0, Draw labels above the item, rather than within the item(off) - unchecked  
>&8=1, Draw labels above the item, rather than within the item(on) - checked  

>&16=0, Display media item gain if set(on) - checked  
>&16=1, Display media item gain if set(off) - unchecked  

>&32=0, Except when the media item height is less than the label height(off) - unchecked  
>&32=1, Except when the media item height is less than the label height(on) - checked  

>&64 &128 &256 -> Preferences -> Video/REX/Misc -> still image thumbnail display mode  
>>0 0 0, Center/tile image (default in earlier Reaper-versions)  
>>0 1 0, No thumbnail  
>>1 0 0, Full height  
>>0 0 1, Stretch image  
for more image-settings, see config variable video_defimglen

Stored in reaper.ini under the same name in the section REAPER.  

Enable "Preserve pitch when changing rate for new items'-checkbox as set in Project Settings -> Advanced, as well as
"On import of media to project"-dropdownlist as set in Project Settings -> Media
It is an integer-bitfield, preferences variable.

>&1=0, "Preserve pitch when changing rate" - checked
>&1=1, "Preserve pitch when changing rate" - unchecked
>&2 and &4 "On import of media to project"-dropdownlist
  
  >> 0 0, Use global preference
  >> 1 0, Copy media to project path
  >> 0 1, Do not copy media to project path
  
>&512 &1024 &2048 &4096 &8192

  >> 0 0 0 0 0 = 2 channels
  >> 1 0 0 0 0 = 4 channels
  >> 0 1 0 0 0 = 6 channels
  >> 1 1 0 0 0 = 8 channels
  >> ...
  >> ...
  >> 1 0 1 1 1 = 60 channels
  >> 0 1 1 1 1 = 62 channels
  >> 1 1 1 1 1 = 64 channels
  
>&65536 &131.072 &262.144 &524.288 &1.048.576 &2.097.152 &4.194.304

  >> 0 0 0 0 0 0 0 = All
  >> 1 0 0 0 0 0 0 = Mono
  >> 0 1 0 0 0 0 0 = Stereo
  >> 1 1 0 0 0 0 0 =
  >> ...
  >> ...
  >> 1 0 1 1 1 1 0 = 61 chan
  >> 0 1 1 1 1 1 0 = 62 chan
  >> 1 1 1 1 1 1 0 = 63 chan
  >> 0 0 0 0 0 0 1 = 64 chan
          
Stored in reaper.ini under the same name in the section REAPER.  

Set media items offline when application is not active and automatically rebuild peaks-settings, as set in Preferences -> Media.  
This is not(!) located in Preferences -> Appearance-Media!  
It is an integer-bitfield, preferences variable.

>&1=0, Checkbox is checked(media items offline)  
>&1=1, Checkbox is unchecked(media items not offline)  

>&2=0, Automatically rebuild peaks - checked  
>&2=1, Automatically rebuild peaks - unchecked  

>&4=0, Allow videos to go offline (slow) - unchecked
>&4=1, Allow videos to go offline (slow) - checked

Stored in reaper.ini under the same name in the section REAPER.  

The generate peak caches-checkboxes in the Waveform media peak caching settings, as set in Preferences -> Media  
This is not(!) located in Preferences -> Appearance-Media!  
It is an integer-bitfield, preferences variable.  

>&1=0, Generate peak caches: on import - unchecked  
>&1=1, Generate peak caches: on import - checked  

>&2=0, Generate peak caches: on project load - unchecked  
>&2=1, Generate peak caches: on project load - checked  

Stored in reaper.ini under the same name in the section REAPER.  

The Desired cache resolution-inputbox, a set in Preferences -> Media.  
This is not(!) located in Preferences -> Appearance-Media!  
It is an integer, preferences variable.

>0 to 2147483647; higher values become negative; default is 300  

Stored in reaper.ini under the same name in the section REAPER.  

The audioformat for Recording, as set in the Project Settings->Media-dialog  
Only includes the format, not the individual format-settings(like bitrate, etc)  
Setting them changes the recording-format, though setting some will not update the Project Settings->Media-dialog properly (Video, GIF, AudioCD)  
but will show WAV instead with the additional dialog-boxes for Video, GIF or AudioCD added.  
If you change the audioformat, it will use the last used setting for the "new" format, as set in this project. Uses the default Reaper-settings for formats in new projects.  
It is an integer, project variable.

>1179012432, Video (ffmpeg/libav encoder)  
>1195984416, Video (GIF)  
>1279477280, Video (LCF)  
>1332176723, OGG Opus  
>1634297446, AIFF  
>1684303904, DDP  
>1718378851, FLAC  
>1769172768, Audio CD Image(CUE/BIN format)  
>1836069740, MP3 (encoder by LAME project)  
>1869047670, OGG Vorbis  
>2002876005, WAV  
>2004250731, WavPack lossless compressor  
  
Stored in reaper.ini under the same name in the section REAPER, when Save as default project settings has been clicked, but with more settings.

Duplicate take FX when splitting items-checkbox, as set in the Preferences -> Media as well as in Preferences -> Editing Behavior as well  
   as in Preferences -> Fades/Crossfades  
This is not(!) located in Preferences -> Appearance-Media!  
It is an integer-bitfield, preferences variable.

>&8=0, Duplicate take FX when splitting items-checkbox - checked  
>&8=1, Duplicate take FX when splitting items-checkbox - unchecked  

>&32=0, Allow dual trim (edit shared media item edges) only if both items are selected(Preferences -> Editing Behavior)(off) - unchecked  
>&32=1, Allow dual trim (edit shared media item edges) only if both items are selected(Preferences -> Editing Behavior)(on) - checked  

>&128=0, Dragging the source start offset of the active take adjusts the offset for all takes(Preferences -> Editing Behavior)(off) - unchecked  
>&128=1, Dragging the source start offset of the active take adjusts the offset for all takes(Preferences -> Editing Behavior)(on) - checked  

>&256=0, If no items are selected, some split/trim/delete actions affect all items at the edit cursor(Preferences -> Editing Behavior)(on) - checked  
>&256=1, If no items are selected, some split/trim/delete actions affect all items at the edit cursor(Preferences -> Editing Behavior)(off) - unchecked  

>&1024=0, Allow mouse on target fade-in/out curve-checkbox(Preferences -> Fades/Crossfades)(on) - checked  
>&1024=1, Allow mouse on target fade-in/out curve-checkbox(Preferences -> Fades/Crossfades)(off) - unchecked  

>&2048=0, Allow mouse on target fade start/end line-checkbox(Preferences -> Fades/Crossfades)(on) - checked  
>&2048=1, Allow mouse on target fade start/end line-checkbox(Preferences -> Fades/Crossfades)(off) - unchecked  

>&4096=0, When editing crossfades with the mouse, use crossfade editor theme colors(Preferences -> Fades/Crossfades)(on) - checked  
>&4096=1, When editing crossfades with the mouse, use crossfade editor theme colors(Preferences -> Fades/Crossfades)(off) - unchecked  

Stored in reaper.ini under the same name in the section REAPER.  

Several peak-settings, as set in Preferences -> Media as well as in Preferences -> Peaks/Waveforms and  
   the menu Options -> Peaks display mode and View -> Peaks Display Settings  
This is not(!) located in Preferences -> Appearance-Media!  
It is an integer-bitfield, preferences variable.

Can be affected by the following actions:
  Peaks: Toggle spectral peaks
  Peaks: Toggle spectrogram
  Peaks: Toggle spectrogram and peaks
  Peaks: Show normal (non-spectral/non-spectrogram) peaks
  Peaks: Scale peaks by square root (half of range is 12dB rather than 6dB)
  Peaks: Rectify peaks

>&1=0, Display peaks for media items(Preferences -> Peaks/Waveforms)(off) - unchecked  
>&1=1, Display peaks for media items(Preferences -> Peaks/Waveforms)(on) - checked  

>&2=0, Display while recording(Preferences -> Peaks/Waveforms)(off) - unchecked  
>&2=1, Display while recording(Preferences -> Peaks/Waveforms)(on) - checked  

>&4=0, Only display peaks for selected tracks(Preferences -> Peaks/Waveforms)(off) - unchecked  
>&4=1, Only display peaks for selected tracks(Preferences -> Peaks/Waveforms)(on) - checked  

>&8=0, Only display peaks for tracks and items that are soloed or not muted(Preferences -> Peaks/Waveforms)(off) - unchecked  
>&8=1, Only display peaks for tracks and items that are soloed or not muted(Preferences -> Peaks/Waveforms)(on) - checked  

>&32 and &256 and &512 and &1024 - Display mode-dropdownlist  

  >> 0 0 1 0, Peaks  
  >> 1 0 1 1, Spectral Peaks  
  >> 0 1 0 1, Spectrogram  
  >> 0 1 1 1, Spectrogram + Peaks  

>&64=0, Always generate spectral peak information (default is only, when spectral peaks enabled) - unchecked  
>&64=1, Always generate spectral peak information (default is only, when spectral peaks enabled) - checked  

>&128=0, Automatically rebuild peaks, if necessary when enabling spectral peaks - checked  
>&128=1, Automatically rebuild peaks, if necessary when enabling spectral peaks - unchecked  

>&2048=0, Scale peaks by squareroot (half of range is 12dB rather than 6dB)(as set in the ...-menu below the dB-inputbox)(off) - unchecked  
>&2048=1, Scale peaks by squareroot (half of range is 12dB rather than 6dB)(as set in the ...-menu below the dB-inputbox)(off) - checked  

>&4096=0, Rectify peaks (half of range is 12dB rather than 6dB)(as set in the ...-menu below the dB-inputbox)(off) - unchecked  
>&4096=1, Rectify peaks (half of range is 12dB rather than 6dB)(as set in the ...-menu below the dB-inputbox)(off) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Contains the bounce-outputfile-settings, but seems not to be updated after having set it once, only in the reaper.ini
It is an integer, preferences variable.
  
Stored in reaper.ini under the same name in the section REAPER, when bounce-cfg-settings have been changed

Offset track template items by edit cursor
It is an integer, preferences variable.

>0, toggle-state off  
>1, toggle-state on  

Stored in reaper.ini under the same name in the section REAPER.  

It is the context-menu from within the wiring-diagram  
It is an integer-bitfield, preferences variable.

>&1=0, only show send wires on track mouseover - unchecked  
>&1=1, only show send wires on track mouseover - checked  
  
>&8=0, show routing controls when creating send/hardware output - unchecked  
>&8=1, show routing controls when creating send/hardware output - checked  
  
>&16=0, only show hardware output/input wires on track mouseover - unchecked  
>&16=1, only show hardware output/input wires on track mouseover - checked  

Reverse horizontal zoom behavior when hand-scrolling-checkbox, as set in Preferences -> Mouse Modifiers  
Only for Project marker/region lane, Arrange view, MIDI marker/region lanes-Modifiers  
It is an integer, preferences variable.

>0, don't reverse(off) - unchecked  
>1, reverse(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Disable targeting bottom part of media item when take lane height is less than-inputbox, as set in Preferences -> Mouse Modifiers  
Only for Media Item Bottom Half-Modifier  
It is an integer, preferences variable.

>0 to 2147483647; in pixels  

Stored in reaper.ini under the same name in the section REAPER.  

Several settings, as set in Preferences -> Mouse Modifiers  
It is an integer-bitfield, preferences variable.

>&2=0, Allow modifying edges of time selection over items in tracks(off) - unchecked  
>&2=1, Allow modifying edges of time selection over items in tracks(on) - checked  

>&8=0, Allow resizing ruler by dragging bottom edge (otherwise drag below toolbar)(off) - unchecked  
>&8=1, Allow resizing ruler by dragging bottom edge (otherwise drag below toolbar)(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Several settings, as set in Preferences -> Mouse Modifiers as well as Preferences -> Keyboard/Multitouch  
It is an integer-bitfield, preferences variable.

>&1=0, Window under cursor(dropdownlist)  
>&1=1, Window with focus(dropdownlist)  

>&2=0, Ignore mousewheel on all faders(off) - unchecked  
>&2=1, Ignore mousewheel on all faders(on) - checked  

>&4=0, Ignore mousewheel on track panel faders(off) - unchecked  
>&4=1, Ignore mousewheel on track panel faders(on) - checked  

>&8=0, Treat scroll message from some laptop trackpads as mousewheel(off) - unchecked  
>&8=1, Treat scroll message from some laptop trackpads as mousewheel(on) - checked  

>&16=0, Prevent ALT key from focusing main menu(off) - unchecked  
>&16=1, Prevent ALT key from focusing main menu(on) - checked  

>&32=0, Ignore mousewheel on transport edit fields(off) - unchecked  
>&32=1, Ignore mousewheel on transport edit fields(on) - checked  

>&64=0, Use pen/tablet-safe mode -- do not reposition mouse cursor while adjusting knobs/etc(off) - unchecked  
>&64=1, Use pen/tablet-safe mode -- do not reposition mouse cursor while adjusting knobs/etc(on) - checked  

>&128=0, Allow space key to be used for navigation in various windows(off) - unchecked  
>&128=1, Allow space key to be used for navigation in various windows(on) - checked  

>&256=0, Horizontal mousewheel over mixer scrolls tracks rather than arrangeview - unchecked
>&256=1, Horizontal mousewheel over mixer scrolls tracks rather than arrangeview - checked

>&512=0, When space key is pressed in plug-in text fields, send to main window - unchecked
>&512=1, When space key is pressed in plug-in text fields, send to main window - checked

Stored in reaper.ini under the same name in the section REAPER.  

Several settings, as set in Preferences -> Mouse Modifiers  
When Reaper sets this variable, this influences config variable mousemovemod as well!
It is an integer, preferences variable.

>0, Edit track names on single click (otherwise doubleclick required)(off) - unchecked  
>1, Edit track names on single click (otherwise doubleclick required)(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Several settings, as set in Preferences -> Mouse Modifiers  
It is an integer-bitfield, preferences variable.

>&1=0, Mouse click/edit in track view changes track selection(off) - unchecked  
>&1=1, Mouse click/edit in track view changes track selection(on) - checked  

>&2=0, Mouse click on volume/pan faders and track buttons changes track selection(off) - unchecked  
>&2=1, Mouse click on volume/pan faders and track buttons changes track selection(on) - checked  

>&4=0, Mouse click below the last track clears media item selection(on) - checked  
>&4=1, Mouse click below the last track clears media item selection(off) - unchecked  

Stored in reaper.ini under the same name in the section REAPER.  

Automute-dropdownlist in the section Mute-settings, as set in Preferences -> Mute/Solo  
It is an integer, preferences variable.

>0, No automatic muting  
>1, Automatically mute master track  
>2, Automatically mute any track  

Stored in reaper.ini under the same name in the section REAPER.  

Reset on playback start-checkbox in section Mute-settings, as set in Preferences -> Mute/Solo  
It is an integer-bitfield, preferences variable.

>&1=0, Reset on playback start(on) - checked  
>&1=1, Reset on playback start(off) - unchecked  

Stored in reaper.ini under the same name in the section REAPER.  

when volume exceeds-inputbox, as set in Preferences -> Mute/Solo  
It is a double float, preferences variable.

>1.0 for 0dB; probably a slider value  
          
Stored in reaper.ini under the same name in the section REAPER.  

Track mute fade-inputbox in the section Mute settings, as set in Preferences -> Mute/Solo  
The value is in milliseconds*10!  
It is an integer, preferences variable.

>0 to 1000  

Stored in reaper.ini under the same name in the section REAPER.  

Do not process muted tracks(muted tracks take no CPU time, etc)-checkbox in section Mute settings, as set in Preferences -> Mute/Solo  
It is an integer-bitfield, preferences variable.

>&1=0, Do not process(off) - unchecked  
>&1=1, process(on) - checked  

>&268.435.456=0, unknown  
>&268.435.456=1, unknown, might be set during rendering  

Stored in reaper.ini under the same name in the section REAPER, but not when &268.435.456 gets added  

Solo in front dimming-inputbox in section Solo settings, as set in Preferences -> Mute/Solo  
It is the dB-value*10  
It is an integer, preferences variable.

>-2147483648(-214748364.8dB) to -10(-1dB)  

Stored in reaper.ini under the same name in the section REAPER.  

Several settings in the section Solo settings, as set in Preferences -> Mute/Solo  
It is an integer-bitfield, preferences variable.

>&1=0, Solos default to in-place solo (alt+click for ignore-routing solo)(off) - unchecked  
>&1=1, Solos default to in-place solo (alt+click for ignore-routing solo)(on) - checked  

>&2=0, Parent and hardware sends unsoloed when a soloed-in-place track sends to another soloed(off) - unchecked  
>&2=1, Parent and hardware sends unsoloed when a soloed-in-place track sends to another soloed(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

The toggle state of the action 40239 - "Options: Toggle always on top"(all sections), which keeps Reaper always as the foremost front window.  
It is an integer, options variable.

Can be affected by the following actions:
  Options: Toggle always on top

>0, toggle state off  
>1, toggle state on  

Stored in reaper.ini under the same name in the section REAPER.  

Move envelope points with media items-menu entry, as set in Options -> Envelope points or settings in the Project Settings -> Advanced
It is an integer, options variable.

Can be affected by the following actions:
  Options: Move envelope points with media items
  Options: Automation items do not connect to the underlying envelope
  Options: Automation items connect to the underlying envelope on the right side
  Options: Automation items connect to the underlying envelope on both sides
  Options: Bypass underlying envelopes outside of automation items
  Options: Chase non-FX envelopes to automation items when underlying envelope is bypassed
  Options: Razor edits affect all track envelopes

>&1=0, don't move points with item(off) - unchecked  
>&1=1, move points with item(on) - checked  

>&2=0, Bezier envelope segments are affected by surrounding non-bezier points(checked)
>&2=1, Bezier envelope segments are affected by surrounding non-bezier points(unchecked)

Stored in reaper.ini under the same name in the section REAPER.  

Snap distance-inputbox in the Snap settings-section of Snap/grid settings, as located in menu Options -> Snap/grid -> Snap/grid settings  
It is an integer, options variable.  

>0 to 2147483647; in pixels; higher values become negative  

Stored in reaper.ini under the same name in the section REAPER.  

Snap media items to nearby media items-checkbox in the Snap settings-section of Snap/grid settings, as located in menu Options -> Snap/grid -> Snap/grid settings  
It is an integer, options variable.

>0 to 2147483648; in tracks; higher values become negative  

Stored in reaper.ini under the same name in the section REAPER.  

Snap media items apart by-inputbox in the section Snap settings, as set in Snap/Grid Settings located in menu Options -> Snap/grid -> Snap/grid settings  
It is a double-float, preferences variable.

>Time in seconds.  

Stored with higher precision in reaper.ini under the same name in the section REAPER.  

Snap media items apart by-checkbox in the section Snap settings, as set in Snap/Grid Settings located in menu Options -> Snap/grid -> Snap/grid settings  
It is an integer, preferences variable.

>0, don't snap media items apart by(off) - unchecked  
>1, snap media items apart by(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Solo in front-setting, as set in the menu Options.  
It is an integer, preferences variable.

Can be affected by the following actions:
  Options: Solo in front

>0, Solo in front(off) - unchecked  
>1, Solo in front(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Some take-lane-settings, as set in the menu Options -> Take lane behavior as well as togled by action 40249  
It is an integer-bitfield, preferences variable.

Can be affected by the following actions:
  Options: Select takes for all selected items when clicking take lane
  Options: Show empty take lanes (align takes by recording pass)
  Options: Allow selecting empty take lanes

>&4=0, Display empty take lanes(on) - checked  
>&4=1, Display empty take lanes(off) - unchecked  

>&8=0, Allow selecting empty take lanes(only with &4=0)(off) - unchecked  
>&8=1, Allow selecting empty take lanes(only with &4=0)(on) - checked  

>&16=0, Select takes for all selected items when clicking take lane(off) - unchecked  
>&16=1, Select takes for all selected items when clicking take lane(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

The alternate peak cache path for the following paths-inputbox, as set in the Preferences -> Paths  
It is a string, preferences variable.

Stored in reaper.ini under the same name in the section REAPER.  

The alternate peaks-path, as set in the Preferences -> Paths  
It is a string, preferences variable.

Stored in reaper.ini under the same name in the section REAPER.  

The Default render path-inputbox, as set in the Preferences -> Paths  
It is a string, preferences variable.

Stored in reaper.ini under the same name in the section REAPER.  

The Default path to save new projects-inputbox, as set in the Preferences -> Paths  
It is a string, preferences variable.

Stored in reaper.ini under the same name in the section REAPER.  

Display-settings as set in Preferences -> Peaks/Waveforms
It is an integer bitfield, preferences variable.

   >&1=0, Program names - checked
   >&1=1, Program names - unchecked

   >&2=0, Text events - unchecked
   >&2=1, Text events - checked
  
Stored in reaper.ini under the same name in the section REAPER.

Several settings, as set in Preferences -> Media and in Preferences -> Peaks/Waveforms.  
This is not(!) located in Preferences -> Appearance-Media!  
It is an integer-bitfield, preferences variable.

>&1=0, Draw edges on peaks(Preferences -> Peaks/Waveforms)(off) - unchecked  
>&1=1, Draw edges on peaks(Preferences -> Peaks/Waveforms)(on) - checked  

>&2=0, Draw edges on waveforms(Preferences -> Peaks/Waveforms)(off) - unchecked  
>&2=1, Draw edges on waveforms(Preferences -> Peaks/Waveforms)(on) - checked  

>&4=0, Draw edges on MIDI events(Preferences -> Peaks/Waveforms)(off) - unchecked  
>&4=1, Draw edges on MIDI events(Preferences -> Peaks/Waveforms)(on) - checked  

>&8=0, Draw labels over solid background for easier reading(Preferences -> Media)(off) - unchecked  
>&8=1, Draw labels over solid background for easier reading(Preferences -> Media)(on) - checked  

>&16=0, Draw faint peaks in folder tracks(Preferences -> Media)(on) - checked  
>&16=1, Draw faint peaks in folder tracks(Preferences -> Media)(off) - unchecked  

>&32 and &64, Display MIDI CC lanes in arrange view-dropdownlist  

  >> 1 1, Do not display CC data  
  >> 1 0, Only the first lane visible in the MIDI editor  
  >> 0 1, One lane combining all CC data  
  >> 0 0, Multiple lanes when space permits (default)  

>&128=0, Draw waveform zero-lines above peaks/waveforms(Preferences -> Media)(off) - unchecked  
>&128=1, Draw waveform zero-lines above peaks/waveforms(Preferences -> Media)(on) - checked  

>&512=0, Scale peaks by pre-fx volume/pan envelopes(Preferences -> Media)(on) - checked  
>&512=1, Scale peaks by pre-fx volume/pan envelopes(Preferences -> Media)(off) - unchecked  

>&1024=0, Antialiased peak and waveform drawing(Preferences -> Peaks/Waveforms)(on) - checked  
>&1024=0, Antialiased peak and waveform drawing(Preferences -> Peaks/Waveforms)(off) - unchecked  

>&2048=0, Fill waveforms to zero line(Preferences -> Media)(off) - unchecked  
>&2048=1, Fill waveforms to zero line(Preferences -> Media)(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

The Sample-level-waveform view-dropdownlist, as set in Preferences -> Peaks/Waveforms.  
It is an integer, preferences variable.

>1, Dots and lines  
>2, Filled samples  
>4, Outlined samples  
>8, Stepped samples  
>16, Smooth  
>32, Sinc smoothed  
>33, Dots and sinc  

Stored in reaper.ini under the same name in the section REAPER.  

Tint strength(0-4)for selected media item background-inputbox(the first one) in section Custom Colors, as set in Preferences -> Peaks/Waveforms  
It is an integer

>0 to 4  

Stored in reaper.ini under the same name in the section REAPER.  

Tint strength(0-4)for selected media item background-inputbox(the second one) in section Custom Colors, as set in Preferences -> Peaks/Waveforms  
It is an integer

>0 to 4  

Stored in reaper.ini under the same name in the section REAPER.  

Flush FX when looping-checkbox, in section Playback settings, as set in Preferences -> Playback  
It is an integer, preferences variable.

>0, don't flush FX when looping(off) - unchecked  
>1, flush FX when looping(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

It is an integer, preferences variable.
          REAPER7
           >

          Stored in reaper.ini under the same name in the section REAPER.  

Max MIDI playback speed when applying negative track playback offset-inputbox, as set in Preferences -> Playback  
It is a double, preferences variable.

>0 to 99999999999999; higher values are possible

Stored in reaper.ini under the same name in the section REAPER.  

Run FX for-inputbox in section Playback settings, as set in Preferences -> Playback  
It is an integer, preferences variable.

>0 to 2147483647; in milliseconds; higher values become negative  

Stored in reaper.ini under the same name in the section REAPER.  

Several settings regarding stopping fx, as set eg in section Playback settings in Preferences -> Playback as well as in section ReWire in Preferences -> ReWire/DX  
It is an integer-bitfield, preferences variable.

>&1=0, Run FX when stopped(Preferences -> Playback)(off) - unchecked  
>&1=1, Run FX when stopped(Preferences -> Playback)(on) - checked  

>&2=0, "Run FX on stop when ReWire devices are active" unchecked, as set in the ReWire-section as set in the Preferences -> ReWire/DX  
>&2=1, "Run FX on stop when ReWire devices are active" checked, as set in the ReWire-section as set in the Preferences -> ReWire/DX  

>&8=0, Flush FX on stop(Preferences -> Playback)(off) - unchecked  
>&8=1, Flush FX on stop(Preferences -> Playback)(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Stop playback at end of loop if repeat is disabled-setting, as set in the Transport-context-menu as well as in section Playback settings of Preferences -> Playback as well as in the section Playback settings, as set in Preferences -> Playback  
It is an integer, preferences variable.

Can be affected by the following actions:
  Transport: Toggle stop playback at end of loop if repeat is disabled

>0, dont stop - unchecked  
>1, stop - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Stop/repeat playback at end of project-checkbox, as set in section Playback settings, as set in Preferences -> Playback  
It is an integer, preferences variable.

>0, don't stop/repeat playback at end of project(off) - unchecked  
>1, stop/repeat playback at end of project(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Settings of the advancement of the arrangeview(scrolling), as set in the Transport-context-menu as well as in section Playback settings in Preferences -> Playback, Preferences -> Recording
It is an integer-bitfield, preferences variable.

Can be affected by the following actions:
  View: Toggle auto-view-scroll during playback
  View: Toggle auto-view-scroll while recording
  View: Continuous scrolling during playback

>&1=0, Automatically scroll view during playback(off) - unchecked  
>&1=1, Automatically scroll view during playback(on) - checked  

>&2=0, Scroll track view while recording (if enabled for playback in options menu)(Preferences -> Recording)(might be not updated in Reaper.ini!)(off) - unchecked  
>&2=1, Scroll track view while recording (if enabled for playback in options menu)(Preferences -> Recording)(might be not updated in Reaper.ini!)(on) - checked  

>&4=0, Don't autoscroll view(when enabled) when viewing other parts of project(Preferences -> Playback)(on) - checked  
>&4=1, Don't autoscroll view(when enabled) when viewing other parts of project(Preferences -> Playback)(off) - unchecked  

>&8=0, Scroll view to edit cursor on stop(Preferences -> Playback)(off) - unchecked  
>&8=1, Scroll view to edit cursor on stop(Preferences -> Playback)(on) - checked  

>&16=0, Continuous scrolling(off) - unchecked  
>&16=1, Continuous scrolling(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Many setting-checkboxes, as set in Preferences -> Plug-Ins  
It is an integer-bitfield, preferences variable.

>&1=0, Set foreground to floating windows when selected - unchecked  
>&1=1, Set foreground to floating windows when selected - checked  

>&2=0, Only allow one FX chain window open at a time - unchecked  
>&2=1, Only allow one FX chain window open at a time - checked  

>&4=0, Auto-float newly created FX windows - unchecked  
>&4=1, Auto-float newly created FX windows - checked  

>&8=0, Auto-open FX add dialog when opening emptry track FX chain - checked  
>&8=1, Auto-open FX add dialog when opening emptry track FX chain - unchecked  

>&16=0, Auto-dock new FX chain windows - unchecked  
>&16=1, Auto-dock new FX chain windows - checked  

>&32=0, Open track FX window on track selection change - unchecked  
>&32=1, Open track FX window on track selection change(only when &2 is set) - unchecked  

>&64=0, Only if any FX window is open - unchecked  
>&64=1, Only if any FX window is open(only, when &32 is set) - checked  

>&128=0, Auto-open FX windows after quick-add - checked  
>&128=1, Auto-open FX windows after quick-add - unchecked  

>&256=0, Show current track FX in FX button right-click menu - checked  
>&256=1, Show current track FX in FX button right-click menu - unchecked  

>&1024 and &131072, FXChain-positioning-dropdownlist
  >> 0 0, Cascade
  >> 1 0, Automatic
  >> 0 1, Modal default

>&2048 and &262144, Floating FX positioning-dropdownlist
  >> 0 0, Cascade
  >> 1 0, Automatic
  >> 0 1, Modal default

>&8192=0, Show FX-list right side of FX Chain window-checkbox - unchecked
>&8192=1, Show FX-list right side of FX Chain window-checkbox - checked

>&16384=0, Show FX chain buttons above FX list-checkbox - unchecked
>&16384=1, Show FX chain buttons above FX list-checkbox - checked

>&32768=0, Show comment field above FX UI-checkbox - checked
>&32768=1, Show comment field above FX UI-checkbox - unchecked
  
>&65536=0, Do not create undo points when closing FX windows-checkbox - unchecked
>&65536=1, Do not create undo points when closing FX windows-checkbox - checked

>&524288=0, Hide FXChain until added - checked
>&524288=1, Hide FXChain until added - unchecked

Stored in reaper.ini under the same name in the section REAPER.  

Automatically resize FX windows "up" and "down"-checkboxes, as set in Preferences -> Plug-Ins  
It is an integer-bitfield, preferences variable.  

>&1=0, up - unchecked  
>&1=1, up - checked  

>&2=0, down - unchecked  
>&2=1, down - checked  

Stored in reaper.ini under the same name in the section REAPER.  

The Recently Added list max-inputbox, as set in Preferences -> Plug-ins  
It is an integer, preferences variable.

>0 to 199  

Stored in reaper.ini under the same name in the section REAPER.  

Several "new project"-settings from the Project settings-section, as set in Preferences -> Project.  
It is an integer-bitfield, preferences variable.

>&1=0, Prompt to save on new project(off) - unchecked  
>&1=1, Prompt to save on new project(on) - checked  

>&2=0, Open properties  on new project(off) - unchecked  
>&2=1, Open properties  on new project(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Prompt when files are not found on project load-checkbox from the Project loading-section, as set in Preferences -> Project.  
It is an integer, preferences variable.

>0, Prompt when files are not found on project load(off) - unchecked  
>1, Prompt when files are not found on project load(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

Look for project media items in project directory before qualified path-checkbox from the Project loading-section, as set in Preferences -> Project.  
It is an integer, preferences variable.

>0, Look for project media items in project directory before qualified path(off) - unchecked  
>1, Look for project media items in project directory before qualified path(on) - checked  

Stored in reaper.ini under the same name in the section REAPER.  

The checkboxes in the ReWire-Client-Settings, as set in the ReWire-section of Preferences -> ReWire/DX as well as in Project Settings -> Advanced  
You must click the "ReWire client project settings"-button, to access the settings-dialog.  
It is an integer-bitfield, preferences variable.  

>&1=0, Ignore tempo change notifications from master-radiobutton selected  
>&1=1, Build tempo map automatically as master plays-radiobutton selected  

>&2=0, Send loop point/repeat change requests to master - unchecked  
>&2=1, Send loop point/repeat change requests to master - checked  

Stored in reaper.ini under the same name in the section REAPER only, when Save as default project settings is clicked(That button is in Project Settings only)  

The "Play project n audio blocks early (usually 0)"-inputbox in the ReWire-Client-Settings, as set in the ReWire-section of Preferences -> ReWire/DX;  
You must click the "ReWire client project settings"-button, to access the settings-dialog.  
It is an integer, preferences variable.

>0 to 2147483647; audioblocks  

Stored in reaper.ini under the same name in the section REAPER, when Save as default project settings has been clicked.

Network max. latency (playback)-slider, as set in Preferences -> ReaMote  
It is an integer, preferences variable.

>1, Synchronous  
>2 to 64, number of blocks  

Stored in reaper.ini under the same name in the section REAPER.  

Render send-ahead-editbox in milliseconds, as set in the Preferences -> ReaMote  
It is an integer, preferences variable.

>-2147483648 to 2147483647  

Stored in reaper.ini under the same name in the section REAPER.  

Max. packet size-editbox, in bytes, as set in Preferences -> ReaMote  
It is an integer, preferences variable.

>256 to 50000; Default is 32768  

Stored in reaper.ini under the same name in the section REAPER.  

The Sample format-dropdownlist, as set in Preferences -> ReaMote  
It is an integer, preferences variable.

>0, 64-bit (default) - Maximum quality  
>1, 32-bit - Reduced network bandwidth use  

Stored in reaper.ini under the same name in the section REAPER.  

Enable Reamote processing-checkbox as set in Preferences -> ReaMote  
It is an integer

>0, checkbox unchecked(ReaMote disabled)  
>1, checkbox checked(ReaMote enabled)  

Stored in reaper.ini under the same name in the section REAPER.  

IDE-settings, as set in Preferences -> ReaScript
It is an integer-bitfield, preferences variable.

>&1=0, Doubleclicking a function name jumps to function definition(control toggle)-checkbox(off) - unchecked  
>&1=1, Doubleclicking a function name jumps to function definition(control toggle)-checkbox(on) - checked  

Stored in reaper.ini under the same name in the section REAPER; is updated as soon as the variable is changed.  

The max number of suggestion from autocomplete in the Reascript/JSFX-IDE.  
It is an integer, preferences variable.

>0 to 2147483647 ; default is 50

Stored in reaper.ini under the same name in the section REAPER; is updated as soon as the variable is changed.  

The Reascript-settings as set in Preferences -> ReaScript  
It's an integer-bitfield, preferences variable.

>&1=0, Enable Python for use with ReaScript - unchecked  
>&1=1, Enable Python for use with ReaScript - checked  
  
>&2=0, Clear Reascript console on ShowConsoleMsg("") - checked  
>&2=1, Clear Reascript console on ShowConsoleMsg("") - unchecked  

>&4=0, Clear Console before running any ReaScript - unchecked  
>&4=1, Clear Console before running any ReaScript - checked  

Stored in reaper.ini under the same name in the section REAPER.  

The Reascript-"Timeout limit for Lua ReaScripts"-input-setting in seconds as set in Preferences -> ReaScript  
It's a double float, preferences variable.
>negative values are allowed, but what's the point?  

Stored in reaper.ini under the same name in the section REAPER, with higher precision(!).  

The Reascript-"IDE watch window update interval"-input-setting in milliseconds as set in Preferences -> ReaScript  
It's an integer, preferences variable.

>1(0.001) to 2147483647(2147483.647); default is 500(0.50)

Stored in reaper.ini under the same name in the section REAPER, with higher precision(!).  

Output manual offset-samples-inputbox, as set in Preferences -> Recording  
It is an integer, Preferences variable
  
>0 to 2147483647; in samples  
          
Stored in reaper.ini under the same name in the section REAPER.  

Use audio driver reported latency-checkbox, as set in Preferences -> Recording  
It is an integer, Preferences variable  
  
>0, don't use audio driver reported latency(off) - unchecked  
>1, don't use audio driver reported latency(on) - checked  
          
Stored in reaper.ini under the same name in the section REAPER.  

Input manual offset-samples-inputbox, as set in Preferences -> Recording  
It is an integer, Preferences variable

>0 to 2147483647; in samples  
          
Stored in reaper.ini under the same name in the section REAPER.  

The audio-information-field in the upper right corner of the screen, as set in it's accompanying context-menu, as well as in Preferences -> Recording  
It is an integer-bitfield, preferences variable.

>&1=0, Check free disk space on record start, warn if less than-checkbox(Preferences -> Recording)(off) - unchecked  
>&1=1, Check free disk space on record start, warn if less than-checkbox(Preferences -> Recording)(on) - checked  
  
>&2=0, Show free disk space/Show free disk space in menu bar(off), unchecked  
>&2=1, Show free disk space/Show free disk space in menu bar(on), checked  

>&4=0, Show recording path/Show primary recording path(off), unchecked  
>&4=1, Show recording path/Show primary recording path(on), checked  

>&8=0, Show recording format(on), checked  
>&8=1, Show recording format(off), unchecked  

>&16=0, Show audio device information(on), checked  
>&16=1, Show audio device information(off), unchecked  

>&32=0, Show recording volume name(off), unchecked  
>&32=1, Show recording volume name(on), checked  
  
set in Preferences -> Buffering -> Advanced Disk I/O Settings!  
      
>&64=1 - Periodially close excess file handles(experimental)-checkbox unchecked  
>&64=1 - Periodially close excess file handles(experimental)-checkbox checked  

Stored in reaper.ini under the same name in the section REAPER.