Apple Logic Pro 7 - Manual (Page 279)

Chapter 6 Logic’s Mixing Facilities 279
Surround
Logic allows for mixdowns in surround format, with up to eight output channels.
Surround formats supported include all common formats, including the most
demanding, like the 7.1 format. To use surround, the audio hardware and driver must
have and support more than two outputs.
Encoding or decoding does not take place. The use of surround does not imply any
manipulation of frequency response characteristics or delay treatment. The processing
only affects the relative volume settings for the output pattern selected for a given
channel. It’s up to you to insert plug-ins into the Output Objects serving as the
surround channels—such as delay or EQs, high, or low pass filters.
All channels and busses can be set to different surround formats independently. Click-
hold the Output slot of the desired Audio Object, and set the output to Surround in the
pull-down menu.
The Pan control is replaced by a two-dimensional surround control. The loudspeakers
are represented by colored dots, and the pan position is indicated by a white dot that
can be grabbed and moved.
Changing the Surround Status of Multiple Channels Simultaneously
You can change the surround status of all selected channels simultaneously. Select all
Objects that you want to set to the same assignment, and hold Option while clicking
on the Output slot. Choose Surround from the menu.