Computer audio conundrum!
Hey all, I'm having a bit of trouble figuring out how to wire up the surround sound on my computer. It's a 4.1 setup, all DIY, consisting of two front IB hi-vi b3s and two rear TB 871s. The sub is a RE audio SE 15 powered by a behringer ep1500. Here's the problem I'm having. As it is right now, I cannot get true surround through my speakers due to the way the sound card is setup. I'm running male RCA into male 1/8 stereo jack from the receiver AUX to the sound card. Now, the sound card is quite good, and has a lot of stuff to fool around it. It's a soundblaster X-Fi card, and has three inputs: right and left input, rear right and left, and a center/sub input. Currently, I'm only using the right and left input because I was running in stereo before. I need to be able to control the rear two channels through the sound card, not just through my receiver. What would be the easiest way to do this? Here's how I'm looking at it: since the sound card is the source, and supports the surround mode, it is definitely sending a stereo only signal into my receiver. What if I were to do the exact same thing as I did for the fronts, but have a second input for the rear? Basically, I would have two 1/8 STEREO jacks into a converter to send it to the receiver through the RCA input. Would the computer be able to recognize that the four channels are independent, or would it merely send the rears the front signal anyway? Basically the question is, how should I hook up the wiring so that the computer knows there are four speakers being processed independently? Any help would be wonderful. 
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