In Logic 7, AFAIR the method available would be the pitch and time machine. If this is just for the purpose of working out notes, I would use it on a copy of the audio files you want to slow down, as it is a destructive process.
Just as a "BTW", Logic 9's Varispeed function allows you to slow down or speed up a whole arrangment with a couple of mouse clicks, and it is non-destuctive.
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