Just bought the C-130 X-perience base back and engine sound were rather annoying. My problem was that there was only two sound sets for four engines and sounds were in phase. It didn't made it sound like four engines running, rather two very loud ones. Also I found that vramps made sound behave rather strange.

I made solution to the problems, but since I have less than 10 posts I can't post link to modifications. I can post it later when I have 10 posts.