audio.device/ADCMD_FINISH

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 NAME
 ADCMD_FINISH -- abort writes in progress to audio channels
 FUNCTION
 ADCMD_FINISH is a command for multiple audio channels. For each
 selected channel (io_Unit), if the allocation key (ioa_AllocKey) is
 correct and there is a write (CMD_WRITE)in progress, ADCMD_FINISH
 aborts the current write immediately or at the end of the current
 cycle depending on the sync flag (ADIOF_SYNCCYCLE). If the allocation
 key is incorrect ADCMD_FINISH returns an error (ADIOERR_NOALLOCATION).
 ADCMD_FINISH is synchronous and only replies (mn_ReplyPort) if the
 quick flag (IOF_QUICK) is clear. Do not use ADCMD_FINISH in interrupt
 code at interrupt level 5 or higher.
 INPUTS
 mn_ReplyPort- pointer to message port that receives I/O request
 if the quick flag (IOF_QUICK) is clear
 io_Device - pointer to device node, must be set by (or copied from
 I/O block set by) OpenDevice function
 io_Unit - bit map of channels to finish (bits 0 thru 3 correspond
 to channels 0 thru 3)
 io_Command - command number for ADCMD_FINISH
 io_Flags - flags, must be cleared if not used:
 IOF_QUICK - (CLEAR) reply I/O request
 ADIOF_SYNCCYCLE- (CLEAR) finish immediately
 (SET) finish at the end of current
 cycle
 ioa_AllocKey- allocation key, must be set by (or copied from I/O block
 set by) OpenDevice function or ADCMD_ALLOCATE command
 OUTPUTS
 io_Unit - bit map of channels successfully finished (bits 0 thru 3
 correspond to channels 0 thru 3)
 io_Error - error number:
 0 - no error
 ADIOERR_NOALLOCATION - allocation key (ioa_AllocKey)
 does not match key for channel

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