Insider,
What is the difference in sounds made by the various models of the 76?
Does a B Model sound any different than an A model or C model?
Not picking on you....but as I read this thread I am amazed at the analytical abilities of some of the other posters based upon scant information and far too often no experience or professional qualifications at all.
I know what you meant by your post....the sound track did not seem to demonstrate "unusual" sounds being emitted by the passing helicopter....but yours is a simple example.
On the other side....some of the efforts to calciulate sounds, ROD's, and other situations by using some Data is interesting but yet in the end serves no real purpose other than to advance the discussion a bit.
At least those folks are trying to make a legitimate contribution as compared to those who are just plain guessing at something with no basis whatsoever.