I think that udev can does this job:
http://alsa.opensrc.org/index.php/Udev
2009/10/8 Alessandro Massignan <ff0000.it@xxxxxxxxx>:
> Hi all,
>
> is there a method to switch an USB card as default (card 0) when i plug it?
> I've a laptop with internal card and when i plug an USB card i wish that all
> running applications output sound to the USB card (without restarting them)
> and when i disconnect it the sound come back to internal card?
>
> Thanks a lot.
> ff0000
>
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