MPK

- note_on, note_off
    - keys
    - pads

- pitchwheel
    - pitchwheel

- control_change
    - modulation wheel
    - joystick
    - play
    - stop
    - rec
    - next/prev step
    - knobs

Deluge

- note_on, note_off
    - note input
    - sequencer pads

- start
    - start button

- stop
    - start button

- clock
    - constantly during playback

Xjam

- note_on
    - pads (never note_off though...)

- aftertouch/polytouch
    - pads, if enabled
    
- control_change
    - knobs

- program_change
    - configurable, currently nothing

OP-1

- note_on, note_off
    - keys

- continue
    - start button (only with clock out/both)

- stop
    - stop button (only with clock out/both)

- start
    - start button but only from beginning of tape (only with clock out/both)

- clock
    - beat match: constantly sent, even if not playing

- control_change (only in MIDI control mode)
    - 4 knobs
    - most non-keyboard keys

- pitchwheel
    - shift+left/right (only when it has the pitch effect also internally)