I definitely second this. The new audio is not very nice at all, especially when we're used to the same audio for 15+ years. Please allow us the option to change back.
To the guy above too, that no longer does anything. The "original" audio is the new one. "Expand" (what ever that is?) doesn't seem to even change anything.
Edit: Played several games now.. I can work with the voice over, it's not great but it's not terrible. The gun fire however is just awful. I can only assume who ever okay'd these changes has never actually played NF.