Just in case you missed it, Peter Gannon said this about tempos for Real Tracks on January 10:

"Typically stretching up 20 bpm, and down 10 bpm is good, but outside of that range artifacts are noticeable. Of course artifacts are noticeable with some instruments at any amount of tempo stretching, even 1 bpm. if you listen to the instrument solo'd. But in a mix, that range (+20, -10 bpm) is a good rule of thumb. Some instruments are harder to stretch - Acoustic Guitar is one of the "hard ones to stretch"."


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