What Is a Tween Track?

I opened an iMovie 6 reference movie in QT Pro to extract the audio track and saw several "tween" tracks in the Movie Properties window. Are these tween tracks needed in any way to extract the basic audio track?
I am sick of waiting for iMovie to export an audio track to aiff. It takes forever.

I think you have a broken link to the user guide:
http://images.apple.com/quicktime/pdf/QuickTime7UserGuide.pdf
If you have ever used Flash you would know what a tween is. And if I remember right Adobe Premiere uses tweens too.
In Flash, let's say you have a ball you want to go across the screen. You place the ball on the stage at point A. Then add a new frame were you want the ball at point B. In between point A and B frames you add the number of frames you want the ball to travel. Flash will figure out the in between frames for you. Making it so you do have to do a frame by frame animation.
This is basically what Body Boomer is saying in a nut shell...interpolating value for you, so you don't have to figure them out...

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