4.2

If you’re modifying a custom setting, there are no additional
steps to take.
View and modify source audio
channels
QuickTime movies can contain multiple audio tracks, and those
tracks can be configured in multiple ways. In Compressor you can
view these tracks, enable or disable them, and reconfigure them
into alternative formats, if necessary, to ensure they are correct in
your transcoded output files.
For example, a QuickTime movie might have an audio track with
two channels erroneously configured as a stereo pair. In
Compressor, you can modify the track so the channels are
treated as two discrete mono channels, or as a specialized format
such as 1.1 (center and low-frequency effects).
Change the format of a source audio track
1. In the batch area, click the job containing the source file you
want to modify.
2. In the Audio Tracks section of the Job Inspector, click the
pop-up menu corresponding to the audio track you want to
modify, then choose a configuration style.