/proc/asound/devices
  1:        : sequencer
  2: [ 0- 3]: digital audio playback
  3: [ 0- 2]: digital audio capture
  4: [ 0- 1]: digital audio playback
  5: [ 0- 1]: digital audio capture
  6: [ 0- 0]: digital audio playback
  7: [ 0- 0]: digital audio capture
  8: [ 0- 3]: hardware dependent
  9: [ 0- 2]: hardware dependent
 10: [ 0]   : control
 33:        : timer