Well if your using the creative lab X-fi fatality 1 pro card on a logitech 5.1 you must have the Z-5500 or the 906 if your hooked up in analoge your really in 1.3 you may be getting sound from the back speaker but the action is only happening in the 2 front speakers and the center if you want true 5.1 and you want to use you sound card to its fullist and your speaker system look up on line and read Dolby Digital live and DTS pack do yourself a favour buy this pack its only $4.70 then you buy a RcA female to stereo jack then you buy Male to Male double sheilded coaxial cable its a single cable you hook to the adapter then plug the adapter to you digital out on your sound card then you plug the other male into your digital in on your...