I feel like an idiot, but here goes. I have a Plantronics P90 headset, and it's connected to my PS3. However, I can't seem to use it online. When it's on and connected, I don't hear anything through the headset, and nothing on the TV. If it's disconnected it comes through my TV speakers. If, at that point, I connect it, it goes silent again. Turning up the headset's volume does nothing. I don't know if this happens in other games - I bought the headset (and the system, for that matter) strictly for GT5.
