Apple Final Cut Pro 6 - Manual (Page 834)

Chapter 2 Assigning Output Channels and External Audio Monitors 49
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With Downmix selected, all audio outputs in your sequence are output as stereo
whenever they’re played back, output to tape, or written to a movie file.
You can turn Downmix off at any time and your audio will be output to multiple
channels again. This is much more convenient than reassigning all of your tracks to a
single stereo channel and then reassigning your tracks to multiple outputs again.
Downmixing During Export
You can select the Downmix button to quickly export multiple audio outputs to a
stereo mix without changing your audio output presets. For more information, see
“
Audio Output Export Settings ” on page 45.
All output channels
are downmixed to a
single stereo pair.
Downmix button
selected
All channels are
output
independently.
Downmix button
deselected