You can revert to quicktime 6.5 from quicktime 7, but you will lose your ipod functionality. It’d be best to upgrade to FCP5, that way, everything will stay up to date.
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G5 Dual 2Ghz <> 4GB RAM <> FCP 5.02 <> Kona 2
ATTO 42XS <> Huge Systems 4105 Fibre