I have the same soundcard (mine is on board) and the same problem.
What I did was I got the latest version of Harddarke installed. I also installed alsa, detect and everything that was necessary for harddrake to be installed.
It then recognized my soundcard. But no sound like yours! xmms would play but no sound.
What I did to get it running was I went into harddrake again. Chose the sound card. and clicked on "run configuration" (or s.th like that, don't remember exactly). A list came up with my sound card in there. I chose it again and pushed ok. boom! The guy said "your sound card has been configued successfuly by harddrake". And there, it works now.
Hope it helps you.