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found something useful
This articile might give you some good insights: http://support.apple.com/kb/HT3855
I've been having trouble with time-stretched audio when trying to adjust tempo. Ultimately, all tracks recorded with Logic Pro have embedded tempo information. So, if you change the tempo of the song, then the tempo of the track changes (causing perceived stretching).
I think if you essentially select a region, then use "Options--> Tempo--> Remove Tempo Information from Audio File" that you can then export the file and it will be naked. You can then import it into a project where the tempo is accurate. (You can also use beatmapping to adjust the tempo of the project, per the article.)
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