Thanks Skuzzy.
I have seen the sound positioning work but only with stereo. I double checked and do have 5.1 in Windows and tested the speakers and they worked fine except in AH. No sound at all from the back.
With the sound positioning feature should I be able to hear something behind me from the rear speakers (i.e., "surround sound"). For example, a tank drives a circle around me. Would I hear the sound move from front left, rear left, rear right, front right or are we basically looking at left/right only with the rears just repeating the front?