Editing : Editing Clips and Selections : Healing Separated Clips

Healing Separated Clips
The Heal Separation command returns separated clips to their original state—provided the clips are still next to each other and their relative start and end points have not changed since the separation.
If you have trimmed or otherwise changed the start or end points of the two clips, or moved them further away from each other, you will not be able to repair them with the Heal Separation command. It is not possible to heal two clips created from different audio files.
To heal a separation between two clips:
1 With the Selector tool, make a selection that includes part of the first clip, the entire separation between the clips, and part of the second clip.
2 Choose Edit > Heal Separation.
 
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Press Control+H (Windows) or Command+H (Mac) to Heal Separation.
If the clips do not heal with Heal Separation, do one of the following to return the separated clips to a single clip:
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Delete one of the two separated clips (verify that Slip mode is enabled so the gap does not close) and use the Trim tool to expand the remaining clip to its original length (see Using the Trim Tools).
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Delete both of the separated clips and drag the original clip from the Clip List to the original location (see Placing Clips in Tracks).