Hi!
I suppose the best way to start might be to create some pcm-device in your
.asoundrc or asound.conf.
There you know exactly how many channels you have.
Only other thing _I_ can imagine might help is: startup alsamixer, see how
many playback channels you have, look for the setting of your card's internal
clock and then try again.
If you don't have to rely on alsa, you could try it with jack. It's much
simpler because you see all channels, listed as ports and then you can connect
them as you wish.
HTH.
Kindest regards
Julien
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