This update supports general compatibility issues, and addresses overall stability and performance issues including the following:
Fixes an issue with the GarageBand Lesson Store not completing single or multiple lesson downloads.
- Corrects issues with some tempo-based effects falling out of sync with main song tempo.
- Resolves problems with Magic GarageBand project files not opening up correctly in the GarageBand tracks view.
The update is recommended for all users of GarageBand '11.