1:        : sequencer
  2: [ 1- 0]: hardware dependent
  3: [ 1- 0]: digital audio playback
  4: [ 1- 0]: digital audio capture
  5: [ 1]   : control
  6: [ 0- 9]: digital audio playback
  7: [ 0- 8]: digital audio playback
  8: [ 0- 7]: digital audio playback
  9: [ 0- 3]: digital audio playback
 10: [ 0- 3]: hardware dependent
 11: [ 0- 2]: hardware dependent
 12: [ 0- 1]: hardware dependent
 13: [ 0- 0]: hardware dependent
 14: [ 0]   : control
 33:        : timer