Phantom audio pops in FCP 7

I'm a working on an FCP 7 project with 10 audio tracks and am experiencing a phantom pop at a specific place in the timeline.
Here's the weird part: I can not isolate the pop. When I turn off any one of the tracks, the pop disappears. It doesn't matter which track I turn off, the pop is gone. The pop also does not appear on any of the original tracks. I've tried replacing each and every one from the viewer to no effect.
Also, if I play 15 frames before the pop, I don't hear it.
When I output there's a colossal sound explosion at the pop point in the timeline.
I've done the obvious things, trashed preferences. Deleted audio waveform cash and render files. But nothing works.
I'm losing my mind and have to finish on Tuesday. Any help would be very much appreciated.
FCP 7 and 10.6 both up to date. Quad-core MacPro with 16G RAM

The likely cause is either:
A) you have audio sources with different sampling rates mixed in the timeline. If this is the case, resample everything to 48khz/16bit.
or
B) You have overwhelmed the ability of FCP to mixdown the audio in Real Time. If this is the case, do an audio mixdown (look it up in FCP help) and/or increase the number of audio tracks for real time audio mixing in FCP's preferences. With 10 tracks used, I'd increase it to 12 or more. The setting can be found in the User Preferences>General section.
x

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OS 10.4.10 Update Causing Audio Popping (AND HUM) Issues:
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Guys/Gals (OS X Engineers):
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Please. Just do the right thing and fix the audio.
There is no need to power cycle the audio subsystem to save .0005 amps on the laptop line.
And then to make your Mac mini/iMac/other desktop users have to put up with it when using AC power is ridiculous.
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Guys/Gals (OS X Engineers):
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Put the audio subsystem back like it was in 10.4.9 and let the laptop battery freaks looking for mini-amp savings get a "work-a-round".
Crikey!
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