I just got an astro a40 headset. It can take a 7.1 over a optical S/PDIF. I'm not able to find a way to get any more then 2 channels. I had a g35, seeing how that was usb I never thought that the 7.1 would work, that's why went with the a40 this time. Is there any way to get 7.1 over optical? Are there any headphones/headsets that work with surround sound in linux?