So I picked up this card and I'm having a couple of problems:   I can't for the life of me understand how to enable some form of stereo upmixing such as speaker fill. Flash player videos upmix automatically for whatever reason but when I'm listening to music it sounds way too sharp and there...

Hey,   I got a pair of HD598s a while ago and have been using them with the Turtle Beach DSS processor which I got for my Xbox. I'm not particularly impressed with the virtual surround it produces along with the fact it doesn't support DTS. The majority of the time I just bypass the Dolby...