MSI have a new sound driver for all VIA 686A/686B based chipset mainboards MS-6309, MS-6321, MS-6330 Series, MS-6341, MS-6347:

Download VIA 686A/686B sound driver WHQL Passed Driver 11 / 05 / 2001 2.36MB for Windows 9x / ME / 2000 / NT / XP

For use only with VIA 686A/686B southbridge motherboards.

Download VIA 8233 sound driver WHQL Passed Driver 11 / 05 / 2001 1.61MB for Windows 9x / ME / 2000 / NT / XP All VIA VT8233 southbridge motherboards K7T Pro266 (MS-6380)

For use only with VIA VT8233 southbridge motherboards.