Did you pass the 'expert' option when you booted? If you did it should have given you the chance to reconfigure your sound card. Whey you reconfigure it check the database to see if your card is in there. I know that an audigy will work with Debian (Knoppix is Debian based) You might need to get a driver for it which of course does you no good until you install it.

You could search here: http://www.linuxquestions.org/index.php

Or here: http://justlinux.com/index.php

wish I had an audigy