Strange popping noise when reversing

Hello,
I have been using iMovie HD 6 for quite a while now (I downgraded), and the reverse feature has been working fine until now. When I reverse the clip (w/o changing the fast/slow marker), a strange popping noise replaces the usually reversed audio. I tried it on an iMac G4 with iMovie 4, and it created the same strange effect. (As an alternative, I've been using +J and Wavepad for the reverse audio) Can anyone fix this?

Hi
• free space on internal boot hard disk ? How much ?
Yours Bengt W

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Press Command + Option + Escape to force quit any application that is not responding.
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