This update addresses general compatibility issues, improves overall stability, and fixes a number of other minor issues. The issues addressed include:
- GarageBand track effects and Audio Units can now be added to a guitar track
- Improved support for Apogee audio interfaces
- Faster switching to full screen in Magic GarageBand
- Improved access to audio monitoring settings
This update is recommended for all users of GarageBand 09. You can install the update by selecting Software Update from the Apple menu at the top left of the screen.