FCP audio noise during video transistions

Hi. I have a strange problem with FCP Studio 2.I captured HDV video onto my scratch disk using ProRes 422,and i finish all basic edits and use Livetype templates to generate lower third titles and drop a few seconds of AVI video to which i also add text using Boris text scrambler to superimpose text onto the AVI video in FCP. Once all is done and rendered on the timeline in FCP i can hear strange audio noise/interference a slight distortion of the audio track during any part where a LiveType title or AVI video has a intensive transition used with a audio track associated with the transition. The more intensive the video transition the more distorted (like a slight pop) the audio gets, it is noticeable. when there is no transitions, the audio is normal. Is this just lack of CPU power on my MacBook Pro causing this audio probelm?
Heath

Is everything rendered -no colored line above the video clips on the Timeline?
You might also need to check that all the render options are checked on.

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