Yeah, I also totally agree with the sound problem.
You should not be able to hear the enemy plane sneaking up behind you, often I have had pilots avoid me even tho I was in a blind spot, I asked them how they knew I was there, they said 'I heard you'.
I am not whining, I totally understand that IL2 cannot be totally 'real', however, it would be nice if it could be fixed for SOW series.