Maintaining Sync While Trimming
The Avid system provides two features to ensure that you do not break sync unintentionally between two or more video and audio tracks when performing single-roller trims.
  You can add black filler to maintain the overall duration of the track.
  You can trim with tracks sync locked.
See the following topics:
  Adding Black While Trimming
  Trimming with Sync-Locked Tracks

Some features described in Help are available only in Avid Xpress Pro or Avid Xpress DV. For more information about Avid Free DV go to
www.avid.com.