For some reason the game is not outputting a Left Surround channel for me. I'm using an ASUS Xonar DSX sound card. The right surround speaker is clearly output footsteps and music when appropriate. The left surround speaker is just silent all the live long day. I checked my speaker setup in the driver, ran a test cycle, and all 4 speakers output sound during the test.

I can only assume it's a problem with the game. I'll try to test some other games as well.