GarageBand for Mac (v10.0): Unexpected behavior with Audio Units plug-ins
You might experience unexpected behavior with some Audio Units plug-ins in GarageBand for Mac (v10.0).
GarageBand for Mac (v10.0) is a 64-bit application and works with 64-bit Audio Units plug-ins. 32-bit Audio Units plug-ins are not compatible. Check with the plug-in manufacturer for an updated version of the plug-in that is compatible with GarageBand for Mac (v10.0).
For some Audio Units plug-ins that require authorization, you might need to authorize them again before you can use them.