MIDI output components
| Field | Notes |
|---|---|
| Output device | Must be in session MIDI outputs |
| Message type | Note On / Off, CC, Program Change |
| Channel | 1–16 |
| Data1 | Note / CC / program |
| Data2 | Velocity / value (ignored for Program Change) |
| Note duration | If > 0 on Note On, schedules Note Off after N seconds |