  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- 0]: hardware dependent
  7: [ 0]   : control
 33:        : timer
