<< Its greyed out and i cant use it. >>
What is greyed out?
<< I was using the other on board on the mobo ok so i mess around with the c media mixer n all i get is DEEP DEEP bass from my logitech z-560 when i put em back on the mobo on board sound they wrk fine. >>
If you have your setup in 5.1 speaker mode, it changes the signal that goes to the miniplug adapters on the expansion card. I believe that bass and center channel go to one of the plugs, surround effects go to the other, and the mains are still from the integrated sound plugs. I'm not sure because I use SPDIF. The Soyo forum has all the answers you are looking for.
<< Also say I hook up an optical line to it, will I be able to use say a Playstation 2 on it? Maybe my home theater dvd player or 200 disk cd changer?? >>
I'm not sure what you are asking here. How many speakers do you have and where are they plugged in? If you want to be able to play the sound from your cd changer or dvd player on your computer speakers, then yes I think the optical in will allow you to do that. I'm not positive though because I run it out to my receiver. Hope you find the answers at the amdmb forum! Good Luck.