Quote Originally Posted by Bonditaria View Post
In 4.55 the aircraft sound is the same from all directions.

In 4.56 the aircraft is louder at the front end!

Not exactly, there's a little more to it than that.

You can hear the effect better in the video below. You'll hear little nuances around the aircraft based on your position to it and when they flyby, for example you are sat at an airport, you should be able to locate the position of the plane better by ear.

1st clip shows 4.5 and before, 2nd clip shows current and there are irrelevant Coffman test bits at the end.