Select all on tracks

`Ctrl` + `Shift` + `A`

All hotkeys for Presonus Studio One (Windows)

File Menu New song	`Ctrl` + `N`
File Menu New project	`Ctrl` + `Shift` + `N`
File Menu Close	`Ctrl` + `F4` , `Ctrl` + `W`
File Menu Save new version...	`Ctrl` + `Alt` + `Shift` + `S`
File Menu Save as...	`Ctrl` + `Alt` + `S`
File Menu Quit	`Ctrl` + `Q`
Edit Menu Duplicate	`D`
Edit Menu Duplicate shared	`Shift` + `D`
Edit Menu Select all	`Ctrl` + `A`
Edit Menu Select all in loop	`Alt` + `L`
Edit Menu Select all on tracks	`Ctrl` + `Shift` + `A`
Edit Menu Invert selection	`Ctrl` + `I`
Edit Menu Deselect all	`Ctrl` + `D`
Edit Menu Deselect all on tracks	`Ctrl` + `Shift` + `D`
Edit Menu Undo	`Ctrl` + `Z`
Edit Menu Redo	`Ctrl` + `Y` , `Ctrl` + `Shift` + `Z`
Edit Menu Paste at original position	`Ctrl` + `Shift` + `V`
Edit Menu Delete	`Delete` , `Backspace`
Edit Menu Delete time	`Ctrl` + `Alt` + `D`
Edit Menu Nudge - Nudge back	`Alt` + `Arrow Left`
Edit Menu Nudge - Nudge	`Alt` + `Arrow Right`
Edit Menu Nudge - Nudge bar	`Ctrl` + `Alt` + `Arrow Right`
Edit Menu Nudge - Nudge bar back	`Ctrl` + `Alt` + `Arrow Left`
Edit Menu Insert silence	`Ctrl` + `Alt` + `I`
Edit Menu Create ranges	`Alt` + `R`
Edit Menu Create ranges on tracks	`Shift` + `R`
Edit Menu Split at cursor	`Alt` + `X`
Edit Menu Split loop	`Ctrl` + `Shift` + `X`
Edit Menu Split range	`Ctrl` + `Alt` + `X`
Edit Menu Move to cursor	`Ctrl` + `L`
Song Menu Import file	`Ctrl` + `Shift` + `O`
Song Menu Mixdown to audio file...	`Ctrl` + `E`
Song Menu Export stems...	`Ctrl` + `Shift` + `E`
Track Menu Add tracks	`T`
Track Menu Remove track	`Shift` + `T`
Track Menu Group selected tracks	`Ctrl` + `G`
Track Menu Dissolve group	`Ctrl` + `Shift` + `G`
Track Menu Mute	`M`
Track Menu Solo	`S`
Track Menu Arm	`R`
Track Menu Monitor	`U`
Track Menu Show FX/Instrument Editor	`F11`
Event Menu Increase volume	`Alt` + `NumPad` `+`
Event Menu Increase volume fine	`Alt` + `Shift` + `NumPad` `+`
Event Menu Decrease volume	`Alt` + `NumPad` `-`
Event Menu Decrease volume fine	`Alt` + `Shift` + `NumPad` `-`
Event Menu Insert part	`Ctrl` + `P`
Event Menu Consolidate selection	`B`
Event Menu Merge instrument parts	`G`
Event Menu Bounce instrument parts	`Ctrl` + `B`
Event Menu Toggle mute	`Shift` + `M`
Event Menu Musical Functions - Quantize	`Q`
Event Menu Musical Functions - Quantize 50%	`Alt` + `Q`
Event Menu Musical Functions - Restore timing	`Shift` + `Q`
Transport Menu Return to zero	`NumPad` `,`
Transport Menu Goto loop start	`NumPad` `1`
Transport Menu Goto loop end	`NumPad` `2`
Transport Menu Goto previous marker	`Shift` + `B`
Transport Menu Goto next marker	`Shift` + `N`
Transport Menu Start	`Enter`
Transport Menu Locate mouse cursor	`Ctrl` + `Space`
Transport Menu Locate selection	`L`
Transport Menu Loop active	`NumPad` `/`
Transport Menu Loop selection	`Shift` + `P`
Transport Menu Loop selection snapped	`P`
Transport Menu Preroll	`O`
Transport Menu Autopunch	`I`
Transport Menu Record	`NumPad` `*`
Transport Menu Click	`C`
View Menu Show instruments	`F6`
View Menu Show effects	`F7`
View Menu Show sounds	`F8`
View Menu Show files	`F9`
View Menu Show pool	`F10`
Studio One Menu Options...	`Ctrl` + `,`
Help Contents	`Alt` + `F1`
Help Context help	`F1`
Navigation Focus next	`Tab`
Navigation Focus previous	`Shift` + `Tab`
Navigation Start	`Home`
Navigation End skip	`Ctrl` + `End`
Navigation End	`End`
Marker Insert	`Insert` , `Y`
Marker Insert named	`Shift` + `Insert` , `Shift` + `Y`
Toolbar Tool 1..6	`1` .. `6`
Console Toggle size	`Shift` + `F3`
Presets Previous/next	`Alt` + `PgUp` / `PgDn`
Misc. Left/right skip	`Ctrl` + `Arrow Left` / `Arrow Right`
Misc. Page up/down	`PgUp` / `PgDn`
Misc. Autoscroll	`F`
Misc. Rewind	`NumPad` `-`
Misc. Rewind bar	`Shift` + `NumPad` `-`
Misc. Previous/next channel	`[` / `]`
Misc. Toggle snap	`N`
Misc. Global mute	`Ctrl` + `Shift` + `M`
Misc. Global solo	`Ctrl` + `Shift` + `S`