Ok here is my report: Marvelous drivers, just amazing is what can be done,(actually, i've got a 4.0 speaker systeme, so Via the drivers, i downmixed 5.1 to 4.0, And i set the Subwoofer/center Output to be a dowmixed 5.1 to 2.0 for my HeadPhone ;)! GREAT!) very low CPU usage compared to creative drivers (I had trouble with winamp when using some badcoded software like kazaa, no more now!) But: with my SB Live 5.1! I've got some probleme to make SPDIF out working, it works for PowerDVD but not for Bsplayer,MPC and other (Tryied both with Moonlight Odio Dekoda and valex's AC3 filter) I just intalled the drivers 2hours ago, so I keep you aware of issue with spdif. EDIT: Ok to play AC3,Actually I can't use SPDIF output, and I need to force 'Kx wave 5.1' audio render instead of default direct sound renderer in graph edit to make thing's well. So I told Bsplayer to use 'Kx wave 5.1' audio render ;)