2:        : timer
  3:        : sequencer
  4: [ 1- 0]: raw midi
  5: [ 1]   : control
  6: [ 0- 2]: digital audio playback
  7: [ 0- 2]: digital audio capture
  8: [ 0- 1]: digital audio playback
  9: [ 0- 0]: digital audio playback
 10: [ 0- 0]: digital audio capture
 11: [ 0- 0]: hardware dependent
 12: [ 0]   : control