Audio distortion in Burned DVD's

I posted this in iDVD, but think it may be an iMovie issue since I didn't have the problem using the iLife 6 apps.
Anyway, just looking for some answers/thoughts.
So I get some distortion, what sounds like maxed volume through crappy speakers when I now that I use iMovie 08, iDVD 08 and Garageband (forced to use because I want custom chapter markers) & I have had the same audio distortion with several projects using various downloaded (amazon) mp3's or LAME rips 224 kbps or higher. I checked the dvd on my PS3 to Pioneer plasma...sounds distorted. Other computers and "simple DVD" players the song is high but can't tell the distortion.
So here's what I'm trying to answer
Is it my PS3-Pioneer TV?
How does the normalization in iMovie work? Does garageband undo it?
Here's why I ask...I set the volume levels for 75% on all music tracks then normalized and exported, loaded in Gband, added chapters and re-exported using share to disk. I saw something speed by that looked liked it said normalizing, and was wondering what that does to the track that is supposedly already normalized.
I plan on running a few tests so that I don't have deal with this again.
I have re-done the audio without normalization, but volume at 75%. I'll import this direct to idvd...test
same thing only run through gband then idvd..test
Any help/info is appreciated...
PS..I usually burn on TDK DVD-R's
shaun

Volume will control the sound from the main Video track. I usually set it at either 100% or 0%, but no reason you cant use other settings.
The Ducking feature controls the volume of the music tracks, extracted tracks, and voiceovers as a percentage of the volume of the main track.
So 100% in Ducking means main track and music track have same volume.
15% ducking means music track is 15% of volume of main track. 0% ducking means that music track is silent.

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