Razer offers free surround-sound virtualization software
 

Surround sound virtualization allows multichannel audio to be simulated using only two speakers. Most decent sound cards and motherboard audio implementations offer some level of support, though the quality varies somewhat. Now, Razer has a software solution of its own—and it's free until December 31.

http://techreport.com/news/25009/raz...ation-software