Editing : Editing Clips and Selections : Trimming Clips : Trim to Insertion Commands

Trim to Insertion Commands
You can trim a clip or MIDI note by automatically removing the material between the Edit insertion point and the start or end point of the clip.
To trim from a start point to insertion:
1 With the Selector tool, click inside the clip or note where you want the new start point to be.
2 Choose Edit > Trim Clip > Start To Insertion. The clip’s start point is automatically trimmed to the insertion point.
 
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Press Alt+Shift+7 (Windows) or Option+Shift+7 (Mac) to Trim Start To Insertion.
To trim from an end point to insertion:
1 With the Selector tool, click inside the clip or note where you want the new end point.
2 Choose Edit > Trim Clip > End To Insertion. The clip’s end point is automatically trimmed to the insertion point.
 
 
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Press Alt+Shift+8 (Windows) or Option+Shift+8 (Mac) to Trim Start To Insertion.