Use previous grid unit

`Ctrl` + `3`

All hotkeys for Ardour

Transport and recording control Destroy last recording	`Ctrl` + `Del`
Transport and recording control Engage record	`↑ Shift` + `R`
Transport and recording control Fast forward	`↑ Shift` + `→`
Transport and recording control Loop play (the loop range)	`L`
Transport and recording control Rewind	`↑ Shift` + `←`
Transport and recording control Set playhead position	`P`
Transport and recording control Start recording	`↑ Shift` + `Space`
Transport and recording control Stop (keep loop / range play)	`Ctrl` + `Alt` + `Space`
Transport and recording control Stop and destroy	`Ctrl` + `Space`
Transport and recording control Toggle auto play	`5`
Transport and recording control Toggle auto return	`6`
Transport and recording control Toggle click (metronome)	`7`
Transport and recording control Toggle playhead follows edits	`↑ Shift` + `F`
Transport and recording control Toggle playhead tracking	`Ctrl` + `F`
Transport and recording control Toggle roll	`Space`
Transport and recording control Toggle selected track rec-enable	`↑ Shift` + `B`
Transport and recording control Toggle selected track solo status	`Alt` + `S`
Transport and recording control Transition to reverse	`↑ Shift` + `↓`
Transport and recording control Transition to roll	`↑ Shift` + `↑`
Session and file handling Add track(s) or bus(ses)	`Ctrl` + `↑ Shift` + `N`
Session and file handling Export session	`Win` + `E`
Session and file handling Import audio files	`Ctrl` + `I`
Session and file handling Open a new session	`Ctrl` + `N`
Session and file handling Open a recent session	`Ctrl` + `↑ Shift` + `O`
Session and file handling Open an existing session	`Ctrl` + `O`
Session and file handling Quit	`Ctrl` + `Q`
Session and file handling Save session	`Ctrl` + `S`
Session and file handling Snapshot session	`Ctrl` + `↑ Shift` + `S`
Session and file handling Toggle selected track MIDI input	`Alt` + `I`
Changing what's visible Fit tracks vertically	`F`
Changing what's visible Move selected tracks down	`Ctrl` + `↓`
Changing what's visible Move selected tracks up	`Ctrl` + `↑`
Changing what's visible Scroll down (page)	`Page Down`
Changing what's visible Scroll down (page)	`↓`
Changing what's visible Scroll up (page)	`Page Up`
Changing what's visible Scroll up (step)	`↑`
Changing what's visible Toggle editor window mixer	`↑ Shift` + `E`
Changing what's visible Visual undo	`↑ Shift` + `Z`
Changing what's visible Zoom height to selected region(s)	`Ctrl` + `Alt` + `Z`
Changing what's visible Zoom height and time to selected region	`Alt` + `Z`
Changing what's visible Zoom in	`=`
Changing what's visible Zoom out	`-`
Window visibility Toggle locations dialog	`Alt` + `L`
Window visibility Focus on main clock	`Num /`
Window visibility Maximize editor space	`Ctrl` + `Alt` + `F`
Window visibility Switch between editor and mixer window	`Alt` + `M`
Window visibility Show rhythm ferret window	`Alt` + `F`
Window visibility Toggle big clock	`Alt` + `B`
Window visibility Toggle color manager	`Alt` + `C`
Window visibility Toggle editor window	`Alt` + `E`
Window visibility Toggle global audio patchbay	`Alt` + `P`
Window visibility Toggle global midi patchbay	`Alt` + `↑ Shift` + `P`
Window visibility Toggle key bindings editor	`Alt` + `K`
Region Operations Move to original position	`Alt` + `O`
Selecting All after playhead	`Ctrl` + `↑ Shift` + `P`
Editing with Edit Point EP to next region sync	`;`
Editing with Edit Point EP to prev region sync	`'`
Editing with Edit Point Cycle to next grid snap mode	`2`
Editing with Edit Point Cycle to next zoom focus	`1`
Editing with Edit Point Insert from region list	`I`
Editing with Edit Point Insert time	`Ctrl` + `T`
Editing with Edit Point Move EP to playhead	`Alt` + `⤶ Enter`
Editing with Edit Point Next EP w/marker	`Ctrl` + `
Editing with Edit Point Next EP w/o marker	`
Editing with Edit Point Trim back	`K`
Editing with Edit Point Trim front	`J`
Editing with Edit Point Trim region end to edit point	`↑ Shift` + `}`
Editing with Edit Point Trim region start to edit point	`↑ Shift` + `{`
Editing with Edit Point Trim region to end of prev region	`Ctrl` + `J`
Editing with Edit Point Trim region to start of next region	`Ctrl` + `K`
Editing with Edit Point Use previous grid unit	`3`
Editing with Edit Point Use next grid unit	`4`
Editing with Edit Point Use previous grid unit	`Ctrl` + `3`
Editing with Edit Point Use next musical grid unit	`Ctrl` + `4`
Aligning with the Edit Point Align end(s)	`Alt` + `A`
Aligning with the Edit Point Align start(s)	`Ctrl` + `Win` + `A`
Aligning with the Edit Point Align start(s) relative	`Win` + `A`
Aligning with the Edit Point Align sync points	`↑ Shift` + `A`
Aligning with the Edit Point Align sync points (relative)	`A`
Aligning with the Edit Point Range end to next prev edge	`Ctrl` + `>`
Aligning with the Edit Point Range end to next region edge	`>`
Aligning with the Edit Point Range start to next region edge	`Ctrl` + `<`
Aligning with the Edit Point Range start to prev region edge	`<`
Edit Point Playback Play edit range	`Alt` + `Space`
Edit Point Playback Play from EP & return	`Win` + `Space`
Edit Point Playback Play selected region(s)	`H`
Region Operations Duplicate region (multi)	`↑ Shift` + `D`
Region Operations Duplicate region (once)	`Alt` + `D`
Region Operations Export selected region(s)	`Ctrl` + `Win` + `E`
Region Operations Increase region gain	`^`
Region Operations Mute/unmute	`Ctrl` + `M`
Region Operations Normalize	`N`
Region Operations Nudge backward	`Num -`
Region Operations Nudge forward	`Num +`
Region Operations Quantize MIDI notes	`Q`
Region Operations Reduce region gain	`&`
Region Operations Reverse	`Alt` + `R`
Region Operations Set fade in length	`/`
Region Operations Set fade out length	`\`
Region Operations Set region sync point	`V`
Region Operations Split	`S`
Region Operations Toggle fade in active	`Ctrl` + `/`
Region Operations Toggle fade out active	`Ctrl` + `\`
Region Operations Transpose	`Alt` + `T`
Generic editing Copy	`Ctrl` + `C`
Generic editing Cut	`Ctrl` + `X`
Generic editing Delete	`Del`
Generic editing Paste	`Ctrl` + `V`
Generic editing Redo	`Ctrl` + `R`
Generic editing Undo	`Ctrl` + `Z`
Selecting All before playhead	`Ctrl` + `P`
Selecting All enclosed by edit range	`Ctrl` + `U`
Selecting All present in edit range	`U`
Selecting Convert edit range to range	`F6`
Selecting Invert selection	`↑ Shift` + `I`
Selecting Select all after EP	`Ctrl` + `↑ Shift` + `E`
Selecting Select all before EP	`Ctrl` + `E`
Selecting Select all in loop range	`Ctrl` + `L`
Selecting Select all in punch range	`Ctrl` + `D`
Selecting Select everything	`Ctrl` + `A`
Selecting Select next track/bus	`Alt` + `↓`
Selecting Select previous track/bus	`Alt` + `↑`
Defining Loop, Punch Range and Tempo Changes Set loop range from edit range	`]`
Defining Loop, Punch Range and Tempo Changes Set loop range from region(s)	`Alt` + `]`
Defining Loop, Punch Range and Tempo Changes Set punch range from edit range	`[`
Defining Loop, Punch Range and Tempo Changes Set punch range from region(s)	`Alt` + `[`
Defining Loop, Punch Range and Tempo Changes Set tempo (1 bar) from edit range	`0`
Defining Loop, Punch Range and Tempo Changes Set tempo (1 bar) from region(s)	`9`