I’ve tried several soundmax drivers for my asus mobo and could not get a soundmax utility. Also even though windows will play test sounds through all the speakers(5.1) I could not get any sound from any but the front left and right speakers when i tried to play any media (mp3.avi. ect).
I was getting very frustrated. Finally I found this site http://www.msfn.org/board/SoundMAX-Audio-Driver-v510016110-v5-t109404.html. Download the Beta drivers and install. after restart configure the soundmax utility first (5.1 or what ever you have). Then configure the windows playback devices to suit your system. Worked like a charm for me!!
Man this was a show stopper for server 2008 workstation in my opinion. Ive got to have my tunes!!!