I have just set up a Logitech z506 5.1 surround sound system and plugged everything into my PC running Windows 8 (trust me I got all of the connections right). I am just using the built in Realtek audio in my Asus P8 z77 mobo and when I test the sound in the Realtek audio manager everything works fine and the surround works fine in SOME games. In a lot of games, youtube, and even DVDs using VLC, I only get audio from the 2 front speakers and the subwoofer.