I'm using headphones w/ simulated surround sound and I'm having a similar issue.
The left ear has barely any sound coming out of it but the right ear sounds normal. (no I'm not losing my hearing in my left ear)
For example, when you get saved at the start of the game and get in the buggy w/ Hagar, I can hear him better in my right ear.
As if I were the one driving and he was sitting to my right.
So on top of all the video and stability issues, the sound is F'd up too...
Great.
GJ id, pissing me off more every minute.