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Most audio commands can operate on multiple channels.  The exceptions are
ADCMD_WAITCYCLE, CMD_WRITE and CMD_READ, which can only operate on one
channel at a time.  You specify the channel(s) that you want to use by
setting the appropriate bits in the ioa_Request.io_Unit field of the
IOAudio block.  If you send a command for a channel that you do not own,
your command will be ignored.  For more details, see the section on
"Allocation and Arbitration" below.

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