30.05.18 19:16, Tanu Kaskinen пише:
> Solving this for any 7.1 or 5.1 card would require first testing if the
> card can be opened with lesser number of cards, and if not, then
> configuring the device with some silent channels. I don't know if the
> alsa configuration syntax allows this kind of conditionality.
> PulseAudio's configuration system doesn't support this.

Approach with auxX channels that you sugguested previously works fine and it 
feels like should be applicable to any device.
Hence there is no need to open device with lesser number of channels if it 
doesn't support that, just emulate it.
It should be nice to the user, doesn't really matter how exactly it is 
implemented internally.

Sincerely, Nazar Mokrynskyi
github.com/nazar-pc

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