I have the Logitech Z-640 speakers. I believe my setup is in 6 channel. I am NOT using a soundcard, i am using the integrated sound on my mobo (Asus P4P800-E Deluxe). My problem is that the sound outputs to the front R & L speakers and the woofer, but not the center speaker or the rear ones. When I use the media program that comes with my mobo, it plays through all the speakers (i'm assuming it simulates the 6ch sound to output through all speakers). Does anyone know how to get Winamp 5 to play through all my speakers as well?