Audio is quieter after flex-ing?

Anyone else experience this or know how to fix it?
I'm not talking about the inherent degradation of audio quality caused by any timestretching algorithm, this is something else.
Even just a tiny flex of a long audio region makes the file a lot quieter, and you can see the waveform is noticably smaller on the graphical overview in the region itself.
maybe there is a setting somewhere which says 'drop the volume by xdB when using flex'? but i cant find it??
system = snow leopard, logic 9.1.5, 32bit, i7 iMac, bear amounts of RAM etc.

This is normal. Multicam by default only uses Audio 1 of the source sequence.

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Audio is quieter after flex-ing?

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