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MIDI messages come from a device named “Keyboard Maestro” which will be created as soon as you add any MIDI action.
Send MIDI Note On — sends a MIDI Note On message, specifying the note, velocity and channel.
Send MIDI Note Off — sends a MIDI Note Off message, specifying the note, velocity (usually 0) and channel.
Send MIDI Control Change — sends a MIDI Control Change message, specifying the control, value and channel.