Apple Logic Express 9 - Manual (Page 263)

• MIDI-controlled effects
As the name suggests, Generator Audio Units plug-ins generate audio signals. In contrast
to software instruments, however, they do not require a MIDI note message to be
triggered.
Audio Units MIDI-controlled effects can be controlled via MIDI, unlike standard audio
effect plug-ins. As such, they are used differently.
Inserting, Removing, and Replacing Plug-ins
You can insert, remove, and replace plug-ins.
To insert effect plug-ins
1 Click a channel strip’s Insert slot.
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.
263 Chapter 10 Working with Instruments and Effects