Can any of you guys tell me what I'm doing wrong... I bought the advance AV pack for my XBOX... the one with S-video and Optical out... I hooked my X-Box up to my receiver with an optical cable... I went into the settings for my XBox and Enabled the Dolby Digital Audio selection. I set my receiver to Dolby Digital for the input I have the XBox hooked into. When I play HALO, The receiver says that it is receiving a signal for all 6 channels, but there is no sound coming from the center channel. The surround effects work great... but it sounds funny with no sound coming from the center channel (the guns don't sound right, you can barely hear them)... Am I doing something wrong... or is the game coded in such a way that there is no sound from the center channel? I know my center channel works... because when I switch back to pro-logic... it comes out loud and clear... Help?