I am having a nightmare getting 5.1 in vista x64. I have tried Soundmax HD audio onboard my Asus P5B Premium. I have also tried an XFi xtreme music which worked fine in xp but only gave me 2 channels in vista x64.


Many websites state that the fault lies with AC3filter. The AC3 website blames lack of driver support.

“Some Vista compatibility issues fixed (matrix editing works and gains are saved correctly). But problem with SPDIF output stays. I did some research and almost sure that problem is with sound card drivers.”


I have since tried new 64 bit drivers for both chipsets but am still only getting 2 channels. All I need is a clean 5.1 spdif output to run through my receiver. Please help.