Based on everything I'm reading the UniAudio drivers should work with that chipset. Have a look at:http://www.os2warp.be/index2.php?name=soundmatrix
and
http://www.os2usr.org/os2sound.html
Also, try the build on Netlabs at:
ftp://ftp.netlabs.org/pub/uniaud/
See if any of it works...
Failing that, disable the sound card on your motherboard and spend between $5 and $10 on eBay for a SoundBlaster Live 5.1 card... they work with UniAudio.