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link till artikelet: https://mortenson.coffee/blog/making-multi-track-tape-recorder-midi-javascript/

p - Play/pause
P (shift+p) - Stop
r - Toggle recording
R (shift+r) - Toggle replace recording
m - Toggle metronome
m + up/down - Change beats per bar
M (shift+m) - Toggle count-in
1-9/0 - Change track
1-9/0 + up/down - Change output device
1-9/0 + left/right - Change output channel
1-9/0 + delete - Delete track
i + up/down - Change input device
up/down - Change BPM
shift + up/down - Change BPM in increments of 10
left/right - Move tape
shift + left/right
Move tape to next/previous bar
t - Add/clear start point
y - Add/clear end point
backspace/delete - Deletes everything between start/end points
shift + backspace/delete - Deletes pitch bends and control changes between start/end points
v - Pastes the current track's data between start/end points to current point
V (shift+v) - Pastes all track data between start/end points to current point
i + p - Plays the timeline and tells the input device to play. Useful for recording drum machines.
u - Undo (for track deletion, note deletion, recording sessions, and paste)
U (shift+u) - Redo

If you need more than 10 tracks, use the "o" key instead of the numerical keys: