The following are more examples of how to tell adcmd_allocate your channel
preferences. If you want any channel, but want a right channel first, use
an array containing 1, 8, 2, and 4:

  0001
  1000
  0010
  0100

If you only want a right channel, use 1 and 8 (channels 0 and 3):

  0001
  1000

If you want only a left channel, use 2 and 4  (channels 1 and 2):

  0010
  0100

If you want to allocate a channel and keep it for a sound that can be
interrupted and restarted, allocate it at a certain precedence. If it is
stolen, allocate it again with the ADIOF_NOWAIT flag set to 0. When the
channel is relinquished, you will get it again.