Editing : Editing Clips and Selections : Editing Stereo and Multichannel Tracks

Editing Stereo and Multichannel Tracks
For more information, see the following topics:
Clips on individual channels within stereo and multichannel tracks cannot be independently selected. All selections for these tracks are time-based, which means that selections made with the Selector or Time Grabber tool extend to each and every channel in the track.
When clips in multichannel tracks are edited with any of the Trim tools or dragged with the Time Grabber tool, material on all channels is affected equally as a group.