/** MIDI command for a note on (activation) event. */
#define MIDI_COMMAND_NOTE_ON 0x90
/** MIDI command for a note off (deactivation) event. */
#define MIDI_COMMAND_NOTE_OFF 0x80
/** MIDI command for a note on (activation) event. */
#define MIDI_COMMAND_NOTE_ON 0x90
/** MIDI command for a note off (deactivation) event. */
#define MIDI_COMMAND_NOTE_OFF 0x80