Florian Hanisch wrote:
> I am running an RME Fireface UCX in the usb-2.0-audio class-compliant
> mode. I can get stereo-sound but alsamixer is not working.
>
> Is there an easy way to get the number of in/out channel that the
> device/the alsa-driver provides ?

Look into /proc/asound/card?/stream0.

> And if there are more than 2/2 channels, how do I activate these
> extra channels ?

Nothing special.  Try the --channels parameter of speaker-test.


Regards,
Clemens

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