EPIC and disturbing audio problem in FCE

I'm editing footage I shot in DV standard on my Canon HV30 in Final Cut Express. I originally imported with iMovie HD and then dragged the files over to final cut later. I rendered all the audio, but when I went back to play it, the audio was strangely looped over itself and repeating. It's hard to explain, and even harder to understand because the audio is of a crowd at a sporting event and therefore not predictable. After listening for a few seconds, and inexplicably loud tone started blaring. It sounded like it was about 300 Hz (by ear, not any real method of measurement). I checked out the audio waveform and nothing looks out of the ordinary, and I can play audio from other programs without any problem. My question is, what the heck is wrong with final cut? An explanation can't really do this justice; I practically had a heart attack, the tone was so loud and unexpected. Does anyone have any idea what this could be from?
Thanks.

The underlying issue is that iMovie and FCE capture DV video differently. You can import an iMovie DV clip into FCE but it will always require rendering of the audio in FCE ... but even then the results are not always predictable.
iMovie captures DV video as *QuickTime DVstream,* essentially as-is from the tape; this means that +the audio & video are interleaved,+ which actually makes editing the audio difficult. (on a miniDV tape, the recording is made up of 10 slanted tracks per NTSC frame, each track containing video, audio & control data for its portion of the frame ... giving you some idea of the complexity of the interleaving).
FCE captures DV video as *QuickTime DV-NTSC (.mov)*, (in North America) putting the audio & video into +separate, parallel, linked tracks+ in the QuickTime file; as a result the audio does not require rendering and it is much easier to edit.
Rendering the audio of a .dv clip in FCE only creates an audio render file that is associated with the original clip; it does not convert the clip to QuickTime DV-NTSC (.mov).
MPEG Streamclip is the utility you should use if you want to convert files from QuickTime DV (.dv) to QuickTime DV-NTSC (.mov).

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