I first learned of QSound from Roger Waters' top-notch album Amused to Death. It essentially turns a mono input into a stereo output that sounds like it's coming from outside the range of your speakers by changing the phase between the stereo channels, creating cancellations in such a way as to produce the illusion. But you have to have your ears in the right place between the speakers for it to work. This QSound processed sound can then be added into a regular stereo mix. Amused to Death uses it on sound effects that are interspersed throughout the songs. I can't say I have any experience with it in games though. I believe other things like the Nintendo DS and WiiU gamepad use a similar method when you set them to surround mode to create their effects. With respect to the topic of this thread though, it shouldn't really have any effect on actual sound quality.
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