If you have a digital 5.1, 6.1, etc. receiver then you can use your Audigy's digital (optical) out to hook up to you stereo system. You could also use the digital (S/PDIF) out on the back of you motherboard (if available). You will have to look at the receiver's manual to determine whether is has digital inputs. From the looks of your computer's hardware (if they are indeed true) that your are set up on that end. With the digital out you will get true DTS and Dolby Digital surround....again depending on the stereo receiver.