Reads a specific MIDI note message from the MIDI input device and returns the velocity of that note.
midiin_note({notenum})
Check the status of MIDI note 60 (Middle C)
midiin_note(60); // returns 1 if the note is active, otherwise 0
midi_note_on midi_note_off midi_ctrl midi_prog midi_play midi_stop midi_is_playing
midiin_channel midiin_prog midiin_note midiin_ctrl