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In article <8GG^X6$@rpi.edu> peck@ral.rpi.edu (Joseph Peck) writes:
>
>...how to correctly select an audio channel for playing a sound.
>
>I get warnings when I compile my program...I select the channel with:
>
>AIOptr->ioa_Request.io_Unit = #;  /* where # is either 1,2,3 or 4. */
>
>Joe Peck peck@ral.rpi.edu

I'm not the audio expert, but I'll try to answer your questions.
Looking through the RKM (Libs&Devs) in the Audio Device section, I found:

p610:  You specify the channel that you want to use by setting the
appropriate bits in the ioa_Request.io_Unit field...

from p615, it looks like the bits are set up as follows:

	CHANNEL_0	(1<<0)
	CHANNEL_1	(1<<1)
	CHANNEL_2	(1<<2)
	CHANNEL_3	(1<<3)

Also, from page 614:  If the allocation succeeds, the audio device
will return the channels that you now own in the lower four bits
of the ioa_Request.io_Unit field...So I would guess that you don't
use numbers like 1,2,3 or 4.

So, even though the field is a pointer, you have to put bit values into
it.  Try something like:

	AIOptr->ioa_Request.io_Unit = (struct Unit *)(CHANNEL_0);

Also, remember to mask out any unused bits when checking the value of
this variable and to set unused bits to zero when setting this variable.
-- 
--
Ken Farinsky - CATS - (215) 431-9421 - Commodore Business Machines
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