Apple Logic Pro 9 - Manual (Page 279)

µ
Set the default size for plug-in windows in the Logic Pro > Preferences > Display > Mixer
pane. This scaling applies to all plug-ins.
Adjusting Plug-in Parameters
This section briefly describes common parameter elements you will find in Logic Pro
plug-in windows. Full details on the parameters of each individual plug-in can be found
in the Logic Studio Instruments and Logic Studio Effects manuals.
To switch plug-in window buttons
µ
Click the button.
It switches to the next or previous option, or will be turned on or off.
279 Chapter 10 Working with Instruments and Effects