How to make Garage Band rescan Audio Units...

Fianly found the solution to get Garage Band to rescan the audio units...
If GB finds a bad audio unit, it lists it as not compatable. If you fix the bug in the audio unit, Garage Band still refuses to load it. I have had this problem with Native Instrument devices like Kontakt. They developed a bug which was later resolved and GB would never list it as available after it was working. Bad news which others have experienced.
This solution worked for Garage Band 4.0, not sure if it is the same with earlier versions.
SOLUTION:
Remove file: com.apple.audiounits.cache
In folder: ~/Library/Caches/
The "~" refers to your home folder name. If you remove this cache file, then launch Garage Band, it will rescan all audio units and test them for compatability and show all the accepted ones.
Whew... took me three days of looking, good luck

You can also use a maintenance program like "Onyx" to clear your caches.
The latest Onyx actualy has a cache cleaning option which by default won't clear the caches of applications using Audio Units so the user doesn't have to go thru all the trouble of rescanning after every maintenance run.
As a side comment to add to this thread. Whenever I clean my cache for GB I always have a problem later with GB initializing. I have a zillion AU's and a few of them hang up GB after a cache cleaning and GB will initilize forever.
I found that to get around this problem I wait for the problem AU's to display their warning windows and then I force quit GB and start it again. After that GB will start right up for me at least with all the AU's scanned and no other problems.

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