Ok. Right now I have my Xbox, with an Advanced AV pack. I have digital optical cable running from the Xbox to an external receiver, which then is connected to speakers. I can get Dolby Digital Sound from my Xbox this way. When I go to college I also want the Dolby Digital Sound. Is this possible with my SB Audigy? If I use one of those Y-cables to run left and right audio to my Audigy's AUX In port, and then go to the speakers, will that provide me with Dolby Digital sound? I thought not, because optical cable is needed. However, there is no Digital In port on the Audigy. So, how would this setup provide me any advantage over running that same cable directly to the speakers without even using the Audigy? I've read about other people doing this... so, my question is: Is Dolby Digital possible with an Xbox, Audigy, and a 4.1 speaker system? Thanks!