Apple Logic Pro 9 - Manual (Page 1282)

Input Pane
The Input pane consists of the following preferences:
• Surround Show As pop-up menu: Allows you to choose the surround format you want
to work in. The choice you make automatically sets the input channel pop-up menus
in the assignment section of the pane.
• Surround Initialize buttons: Allow you to choose between the default setup of Logic Pro,
the ITU (International Telecommunications Union) standard, and the WG-4 standard.
1282 Chapter 44 Preferences in Logic Pro