The PCM2702E works fine under linux with the usb-audio driver and I figure the 2704 should also work fine since I believe it is a standard compliant usb audio device. You can use multiple sound cards under linux, actually as many as you want on the machine. If linux supports the card, but setting up alsa can be a little tricky. If anyone wants some help on such things they can email me or post a question. I just ordered my TA-10 and have been thinking about ordering the UD-10. Some cool products Trends is building. I plan on having my TA-10 battery and solar powered. enviro-friendly