sub-IDs:
01 = Sample Dump header
02 = Sample Dump packet
03 = Dump Request
04 = MIDI Time Code Setup
05 = Sample Dump extensions
06 = Inquiry Message
07 = File Dump
08 = MIDI Tuning Standard
09 = General MIDI Message
7B = End of File
7C = Wait
7D = Cancel
7E = NAK
7F = Ack

sub-IDs:
01 = Long Form MTC
02 = MIDI Show Control
03 = Notation Information
04 = Device Control
05 = Real Time MTC Cueing
06 = MIDI Machine Control Command
07 = MIDI Machine Control Response
08 = Single Note Retune