Go to preferences, Advanced, and uncheck Auto Normalize. Now go to Share, Export Song to Disk. That will give you the highest quality coming from GarageBand.
Cody Walters
Mac Pro 2.26GHz 8 Core
16 GB 1066 MHz DDR3
Final Cut Studio 3
Adobe CS5 Master Suite
Panasonic HVX-200
Canon 7D
http://www.codywaltersvideo.com