View: Move cursor left one pixel

View: Scroll horizontally (MIDI CC relative/mousewheel)

View: Move cursor right one pixel

Move edit cursor

Select notes or CC in time selection

Move edit cursor ignoring snap

Clear loop or time selection

Zoom to selected notes/CC, or to project loop selection

Deselect all notes and move edit cursor

Deselect all notes and move edit cursor ignoring snap

Deselect all notes

Insert note

Insert note ignoring snap

Close current project tab

File: New project

Edit: Undo

Edit: Cut items/tracks/envelope points (depending on focus) ignoring time selection

Edit: Copy items/tracks/envelope points (depending on focus) ignoring time selection

File: Quit REAPER

Help: About REAPER

Help: Mouse modifier keys and action shortcuts

Insert media files...

Item properties: Show media item source properties

Item properties: Toggle items/tracks mute (depending on focus)

Item properties: Toggle show media item/take properties

Item: Add stretch marker at cursor

Item properties: Decrease item rate by ~0.6% (10 cents), clear 'preserve pitch'

Item properties: Decrease item rate by ~6% (one semitone), clear 'preserve pitch'

Item properties: Increase item rate by ~0.6% (10 cents), clear 'preserve pitch'

File: Save project

Item edit: Toggle open/close nudge/set dialog

Item grouping: Group items

Item grouping: Remove items from group

Item grouping: Select all items in groups

Markers: Go to marker 01

Markers: Go to marker 02

Markers: Go to marker 03

Markers: Go to marker 04

Markers: Go to marker 05

Markers: Go to marker 06

Markers: Go to marker 07

Markers: Go to marker 08

Markers: Go to marker 09

Markers: Go to marker 10

Markers: Go to next marker/project end

Markers: Go to previous marker/project start

Markers: Insert and/or edit marker at current position

Markers: Insert marker at current position

Markers: Insert region from time selection

Item: Insert time on tracks and paste items

Item: Open item inline editors

Item: Dynamic split items...

Item: Paste items/tracks

Item: Remove content (trim) behind items

Item: Show FX chain for item take

Item properties: Normalize multiple items to common gain

Item navigation: Move cursor to next transient in items

Item: Duplicate items

Item: Crossfade items within time selection