Here's part of the interview, too:
CNN: What's it like to be part of the "Alvin and the Chipmunks" franchise?
Jesse McCartney: The Chipmunks have been around since my parents, and even before then. Sitting on the couch at 10 years old, eating cereal and watching the Chipmunks as a kid, being one of my favorite cartoons -- it's a little strange.
CNN: Have you had to work with a vocal coach to tap into the Chipmunk voice?
McCartney: I have a naturally low speaking voice, so when I get there, he warms me up a little. We go through some drills because Theodore has the highest voice of all three of the Chipmunks.
CNN: Do they record your voice in real time, and then speed it up?
McCartney: You have to do it slower than real time and pitch your voice up. I talk really slowly with the same intensity of a normal conversation, and that's sort of what they take and then they speed it up.
It's a really fine line. You either sound like a Chipmunk or an alien. You do the same line 50 times until you get it right.
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