Sgt-PieFace

So I just downloaded The Dark Mod and I can't set my sound to the surround option. It says the game couldn't find a 3D sound device. I use a Logitech gaming headset that uses the Logitech Gaming Software through USB to play surround sound, so its separate from the windows audio driver. Is there a way to make the game detect this, or is there a work around. Thanks!