I have an old(6yrsold)creative labs dtt 3500 digital 5.1 set up for speakers on my pc...I recently put together a new rig which has a xfi xtreme gamer 7.1 soundcard that doesnt have the old digital din output that I used to connect for 5.1 sound ...It does have a optical output that I have a connection for on my speaker setup that I am using...Question is,am I getting 5.1 sound from the optical connection?I dont have the 3 outputs for surround sound that newer sytems have.My only option is the optical cable or I have to buy a new pc speaker set up....