The USB standard contains a protocol for sending audio over
USB. I don't know if the Linux USB drivers support this, though. I don't know what sort of PC drivers are needed either...

My slow memory tries to tell me that the minimal requirement for a USB host is to supply 0.5A... but I'm not sure of this. I've got the USB standard at home, I'll have a look.

Marius (Escort Cab + Mark II)