Apple Logic Express 7 - Manual (Page 12)

12 Chapter 1 Basics
To add a plug-in:
1 Click-hold on an Audio Object’s Insert/Instrument slot.
2 The plug-in-menu appears, showing all available plug-ins. Move the mouse through
the different levels of the hierarchical menu and choose a plug-in name, then release
the mouse button.
The Plug-in window is launched automatically. If you do not want the Plug-in window
to open automatically after insertion, uncheck the
Preferences > Audio > Display > Open
Plug-in window on insertion preference.
You can open a closed Plug-in window by double-clicking on an assigned Insert/
Instrument slot.