Imovie audio issues-URGENT

Hi,
I downloaded some video footage off youtube because i'm making a compilation video. I put the files into imovie ('09) and arranged them in the order i wanted, and then detached the audio from some of the clips and deleted it. I put a backing track to it, and when i play it in imovie it plays exactly how i want it to. However, as soon as i export it it plays the audio from hte original clips as well (even though i have deleted it!) I have tried various times turning the volume right down, and deleting the audio again and again, however, each time it still does it!
How can i fix this?
Thanks in advance

There is a bug in iMovie 09 that causes unpredictable audio behavior when you use non-standard fast motion or slow motion. When you change speeds, you will see some "tick marks" next to the nice even numbers like 25%, 50%, 75%, 100%, 200%, 400%, 800%, etc. If you select one of these, your audio should work fine.
However, if you create a custom percentage, like 58% or 139%, then you get these weird audio artifacts.
There are only two solutions I know of.
1) If you really need a custom speed change, don't use audio.
2) Change all your speed changes to one of the presets.
This is fixed in iMovie 11, not by allowing custom speed changes, but by forcing you to stick with the tick marks.
On Final Cut Pro X, you have full flexibility on speed changes.

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