One note on the .63 (offline) sound that came about:

We've all noticed this internal/external switch that you get with the wind noise reduced when coming into a room. But when inside, I was able to hear an infected walking around and grumbling in another building right across. Didn't know he was there.

Got out again, the infected noise would get somewhat covered with the wind noise back.

But back inside, it's just the wind noise reduced, not the sounds from the infected in the other building.

Can't really make a clip right now, and my offline playing ends in 15-20 minutes due to the game crashing into desktop regularly.