Just wanted to let everyone know about an incompatibility between Garage Band 3 and Logic 7 I found today (I'm using express, but apparently this is an issue in Pro as well). If you create a song file in Garage Band 3 and then try to open it in Logic 7 it will give you a warning saying Core Audio plugin "Ducker" not found, and your song will have no audio output (i.e. It will play but you won't be able to hear anything). I did a little poking around online and found out that this issue will be fixed in February with the universal binary version of Logic, but until then if you need to open Garage Band files in Logic you might want to hold off on the upgrade to iLife 06. If anyone comes up with a workaround please let me know. I haven't been able to figure out anything so far.