Mysterious sound appears in my movie after burning

I originally posted this in the iDVD forum, since it seems to be an iDVD issue, but since no one answered I thought I would try here:
I made a 10-minute video in iMovie '09 and burned it to a disc using iDVD 7.0.4.
The movie itself is completely silent with the exception of music I added. To achieve the silence, I brought the volume level down to zero on all the clips. I then added the music tracks.
When I preview the movie in iMovie, it looks and sounds great. But after I burn the disc using iDVD and watch it, I notice that at a few sections lasting a few seconds near the end, you hear what sounds like camera noise. It's as if the muted volume became unmuted for a few seconds here and there, and you hear what sounds like the camera humming or other unidentifiable white noise.
This only happens on the finished DVD. In iMovie (before burning), the sounds are not there. I checked all the volume levels on all the affected clips, and they are all at zero.
Note that I am only describing it as camera noise because that's what it sounds like. I have no evidence that it is camera noise.
Can anyone help me get rid of this noise that's ruining my movie? Thanks.

John,
In a late-night stupor I decided to double-check those altered clip speeds.  Sure enough, a few of them were not kosher!  Err, I mean, not presets.  I tweaked them to preset levels, and voila!   No more mysterious noise!
This was quite unlike the problem I had last year that you helped me with--in that case, the manifestation of using non-presets was that at a certain point in the video, the audio tracks became completely disengaged from the video. So you'd have people moving their lips silently and then you'd hear their words 10 seconds later.
Makes you wonder if they fixed this particularly annoying glitch for iMovie '11?!

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