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 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
If you experience difficulties with a 64-bit Audio Units plug-in in GargeBand, please update to GarageBand 10.0.1.
For some Audio Units plug-ins that require authorization, you might need to authorize them again before you can use them.