Apple Logic Pro 9 - Manual (Page 268)

A menu appears, showing all available effect plug-ins, sorted into different categories.
2 Browse through the categories and choose a plug-in name by clicking it. A plug-in version
that matches the chosen channel strip input format is loaded.
You also have the option of choosing a mono or mono-to-stereo version of the plug-in,
for example, by clicking the appropriate entry.
Logic Pro effect plug-ins are displayed in various categories such as Delay and Reverb.
Further submenus, such as Audio Units and TDM, are also available if plug-ins in these
formats are installed on your system.
268 Chapter 10 Working with Instruments and Effects