  1:        : sequencer
  2: [ 0- 3]: digital audio playback
  3: [ 0- 7]: digital audio playback
  4: [ 0- 8]: digital audio playback
  5: [ 0- 9]: digital audio playback
  6: [ 0-10]: digital audio playback
  7: [ 0-11]: digital audio playback
  8: [ 0-12]: digital audio playback
  9: [ 0-13]: digital audio playback
 10: [ 0-14]: digital audio playback
 11: [ 0-15]: digital audio playback
 12: [ 0-16]: digital audio playback
 13: [ 0- 2]: hardware dependent
 14: [ 0]   : control
 33:        : timer
