I haven't examined the audio files, of course, but normally the sounds are normalized to something like a maximum of -6db with digital sounds. I started there in my first audio pack, but changed it later under pressure of complaint. I should have left it alone.
I am planning on just updating the engines (tracks, guns, and turrets) and leaving the flaps and landing gear alone, because people complained that they couldn't hear those things in my sounds. I had done that on purpose to match what you would have really heard, but just like the complaints now people didn't know what they were complaining about. I think.