VIA Vinyl AC'97 Codec Combo Driver 7.0b is required in case you need to support VIA Six-TRAC.

Disclaimer: You can have a look here on the Via Tech website to see if there are any more recent versions.

It also supports the VIA Six-TRAC (VT1616 Codec), and the driver allows you to experience a new level of audio performance and functionality. It includes updates, enhancements, or bug fixes. Compatible on Windows Me, Windows 98, Windows 95, Windows 2000, Windows Vista, Windows NT, Windows XP. Vinyl AudioCodec is a driver that supports all VIA programs with integrated sound, such as VT8231, VT82C686A, VT82C686B, VT8233, VT8233A, VT8233C, VT8235, VT8237, VT8287.