Is there a documentation somewhere that briefly describes what each of the automation parameters in GarageBand '08 stand for?

Thanks,
Mason

[analogika]

They're all parameters that you can see and edit in the window of each plug-in (in the Info area on the right, have it show "more Details" at the bottom to see the plug-ins.

The included plug-ins are documented in the GarageBand manual in the Help menu.