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Audio Expert: It's Not Britney Spears

12/1/2010 7:04 PM PST BY TMZ STAFF

A certified audio expert who has analyzed the purported recordings of Britney Spears speaking to Jason Alexander tells TMZ ... he believes the female voice is not Britney.

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Arlo West, who is a certified forensic audio expert, tells us, "In my opinion, it's not her voice in the recording."

West, who compared the recordings with a half dozen interviews Britney has done over the years, says "Listening to the phonetics, it doesn't appear to be authentic," adding, "the mannerisms in her voice just don't match up."

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