Apple Logic Pro 9 - Manual (Page 1163)

2 Choose the surround format you want to work in from the Show As pop-up menu.
This automatically sets the input and output channel pop-up menus in the assignment
sections of both the Output and Input tabs.
Note: The surround format chosen here only alters the layout/routing of channels to
speakers in the assignment section. The actual project surround format is determined by
the Surround Format setting in Audio project settings (see
Setting the Project Surround
Format ).
To determine which speakers the Logic Pro outputs are sent to in the Output tab
Do one of the following:
µ
Choose the output of your audio interface from each of the active pop-up menus: Left,
Center, Right, and so on.
You can choose outputs that don’t exist for your hardware, allowing you to work on, or
create, a surround project with a computer that is not equipped for surround playback.
These are shown in parentheses. As examples: (Output 17) or (Output 32).
1163 Chapter 39 Working with Surround