This update is recommended for all users of GarageBand ’09. Improved access to audio monitoring settings.Faster switching to full screen in Magic GarageBand.
If Im understanding you, and maybe Im not, you want to take GB 11 files and bring them into older versions. 'This update addresses general compatibility issues, improves overall stability, and fixes a number of other minor issues. Garageband For Mac Os X 10.5 8 Free Download. 'The 10.5.8 Update is recommended for all users running Mac OS X Leopard and includes general operating system fixes that enhance the stability, compatibility and security of your Mac, as well as specific fixes for: (Software Update and 274MB or 759MB combo direct download)