Yea, same with me, except in the city near the end of the game. That level was the worst for the Audigy bug for me. The others though were very tolerable.
It would occasionally skip and I would get a repeated sound...i don't really know how to explain it....i could tell it was a sound bug, because my framerate was so high. It did this very occasionally in all the levels, but it was much greater in the city level.
Now I just really hope the patch isn't too big....I really will need to download it. But chances are it will be...they expect everybody to have a high speed connection today.