In GarageBand, click on "Share", and then "Send Song to iTunes". This saves it in the Library in an iTunes open-able format. Open iTunes, then "Open File", then find your file. It will play it in iTunes. You probably need to Save As then select mp3 at this point; I can't remember. I"m rushed at the moment, so I'll check again for you tomorrow or Monday.
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Date: 2010-02-20 05:20 pm (UTC)