If you need to apply an "extra-fast" or "extra-slow" setting to an iMovie clip, here's how you can go beyond the standard iMovie limit:
Select the clip to modify. Speed up or slow down in timeline as usual (probably the max setting, since you want more than that). Next, apply <b>any</b> effect, and now you have a 'new' clip. This 'new' clip can now be slowed down or sped up again.
Without applying the effect to make it a 'new' clip, iMovie will only let you slow down or speed up to the max value one time.
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