for usb audio cards there's a good explanation here
https://help.ubuntu.com/community/UbuntuStudio/UsbAudioDevices

anyway to make it simple:

1) check that your system recognized the usb audio:
cat/proc/asound/cards

2) set the desired card as default used:
sudo nano /etc/modprobe.d/alsa-base
go to the bottom and change the index of the default card from -2 to 0

cheers.




On Sat, Jun 16, 2012 at 10:54 PM, [email protected] <
[email protected]> wrote:

> Hello All,
>
> I'm about to reinstate my 3 way multiseat configuration (2 seats and one
> for the tv), up until now I didn't used the sound cards but now as I got a
> usb sound card I want to add sound support.
>
> is there a way to define in xorg.conf what sound card will be used by what
> seat?
>
> Thanks.
>
> An wise Scandinavian old man once said: "in the end, everything is going
> to be alright"
>
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