I have this setup at the moment:
Xbox with VGA cable connected to PC monitor.
The sound cable from the VGA is connected to the back of my computer tower.
My turtle beaches are in the front of the computer.
I recently installed a wireless PCI card as to remove wires. I turned on my PC and bridged connections, Turned my xbox on but game and dashboard sounds are very quiet? the voice chat is fine.
When I turn off my PC the sound goes back to normal so I am confused?