Creative's Audigy has a slick feature called CMSS that enables 5.1 upmixing of stereo. The only place I've found a way to turn this function on or off is in the Creative Playcenter which I don't like to use for my media. Some recordings sound great with this, and others are bad (the better the original source the more convincing it becomes).

I suspect that turning CMSS on/off in Creative Playcenter 3 is something that there is a workaround for. The Audigy 2 includes this feature and puts the control in a much better location, but I can't convince myself to upgrade just for a software switch. <img src=/S/smile.gif border=0 alt=smile width=15 height=15>