snd_hda same output on two pcms?

[J.R. Oldroyd]

Is it possible to configure snd_hda so that one output is available
on two pcm devices?

I would like:
	pcm0:	built-in speaker, headphone jack
		mic

	pcm1:	built-in speaker only

My default hda config is here:

	http://opal.com/jr/snd_hda/default.txt

I added the following device hints:

	hint.hdac.0.cad3.nid20.config="as=1 seq=0"
	hint.hdac.0.cad3.nid21.config="as=1 seq=15"
	hint.hdac.0.cad3.nid24.config="as=2 seq=0"
	hint.hdac.0.cad3.nid25.config="as=2 seq=1"
	hint.hdac.0.cad3.nid22.config="as=3 seq=0 device=Speaker conn=Fixed"

The result is here:

	http://opal.com/jr/snd_hda/changed.txt

The result is that pcm0 works as expected, but the initialization
of pcm1 fails, as can be seen in the trace: 

	hdac0: Tracing association 2 (3)
	hdac0:  Unable to trace pin 22 seq 0 with min nid 0
	hdac0: Association 2 (3) trace failed

I also tried:

	hint.hdac.0.cad3.nid22.config="0x99130130"

with the same failed result.

I note the last paragraph in the snd_hda man page:

	BUGS
	Due to OSS limitation multichannel (not multidevice) playback
	is not supported.

Does that mean I cannot do what I am attempting to do?

	-jr