I wish to build a setup delivering audio from a single board computer, probably running Linux, to my receiver, a Denon X1000. I don't have a particular board yet, and the choice of audio over HDMI may / may not be available to me. That actually poses a question - if HDMI audio is available, is...

Hi all, I have a question about some hardware I've seen on eBay. namely the CM6631A  USB cards   I have seen many of these cards on eBay, and of the same thing with USB and optical/coax digital connectors. I am wondering, are they actually soundcards? That is, can I hook one up to a computer...