It sounds as though you are saving your audio at too high a level.
How are you judging the loudness of your video? You can never trust the sound coming out of your computer speakers.
I very much recommend you open your Audio Meters and make sure that none of your audio peaks "in the red". Set your audio so that none of your audio levels are louder than zero.
Thanks for your answer.
thats what I did at the end.
I tried judging with speakers, as well as headphones. both with the same result.
before PE11 I edited the same audio in windows movie maker and I never had problems like that.
Tuning the tone, and then looking at the meter to lower the overall loudness.
I just thought there was a way, to hear the outcome before exporting...
I occasionally have problems listening to stereo sources through headphones if my sound card is set for a 5:1 speaker setup. I think when it happens that the sound card is simulating the rear channel sound by reducing the volume of the front channels and feeding it to the rear. Then for some unknown reason it is the reduced volume channels that get fed to the headphones (probably a fault with the sound card drivers)
You might want to check your sound card settings and make sure they are set to stereo or headphones.
Insanity is hereditary, you get it from your children.
my headphones are set to stereo