To all you helpfull lot I am connecting my Terratec 5.1 soundcard via the optical out to my homecinema amplifier using a normal optical cable.I am able to play files from my PC' such as mp'3's and hear them via my homecinema amp in stero or two channel mode only! When I try to play an avi file or a dvd encoded in dolby digital 5.1 surrond I am able to get only 2 channel stero??? rather than the full 5.1 via my homecinema reciver and my 5.1 speakers I notice in the terratec manual and aurreon "fun mixer software" that it says s/p-dif output only works in 2 channel stero or headphones!!!? please HELP I want to be able to play dvd's and avi files from my pc and hear the FULL 5.1 soundtrack via my homecinema speakers and amp which are connected to my terratec fun card. Is there something im missing or perhaps some fix? Please help guys Link's Here is a copy of the souncards manual see pg 25 for "s/p-dif output only works in 2 channel stero or headphones" ftp://ftp.terratec.net/Audio/Aureon/Aureon5.1Fun/Manual/AureonFun_Manual_GB.pdf My amp's a sony strde495 http://www.richersounds.com/index.php?f=itemdetl.php&p=301893&PHPSESSID=af73fb9c932769c0018f0dad1c29739a Thank's a million to all who reply Dino.