I definitely suck at the beta.

I have a question, currently I use Pioneer DIR-800C headphones with 5.1 (DD) hooked up from my XBox using TOSLINK. The sound is AMAZING, but when I use xbl I have to hook up the cheapo headset to the controller and wrap the mic around my neck leaving me with a makeshift gaming headset. Although the sound is crystal clear (and painfully loud), its SO loud that it washes out the chat coming into the headphones. My software chat volume is maxed out and ODST/Reach doesn't allow me to modify the in-game sound. What can I do to increase the chat volume and/or decrease the music/sound effects?