JACK Metadata API: event-types
This is a kludge around Jack only supporting MIDI, particularly for OSC. This property is a comma-separated list of event types, currently “MIDI” or “OSC”. If this contains “OSC”, the port may carry OSC bundles (first byte ‘#’) or OSC messages (first byte ‘/’). Note that the “status byte” of both OSC events is not a valid MIDI status byte, so MIDI clients that check the status byte will gracefully ignore OSC messages if the user makes an inappropriate connection.