Are you using ALSA or OSS? I couldn't find any listing for a "Crystal Soundfusion" card on ALSA's site
but I did some googling and I found that some sound card called Crystal Soundfusion uses the CS4280 chip, which is supported by ALSA. Check here
for details on how to get it working. My advice, though, is to find out what chip your card uses and then see if it's supported by ALSA.