Trimming with Nudge
You can trim the start and end points of clips (or MIDI notes) by the current Nudge value.
To trim a clip’s start or end point by the Nudge value:
2. With the Grabber tool, select the clip you want to trim.
3. Do one of the following:

While pressing Option (Mac) or Alt (Windows), press Plus (+) or Minus (–) on the numeric keypad to trim the clip’s start point by the Nudge value.

While pressing Command (Mac) or Control (Windows), press Plus (+) or Minus (–) on the numeric keypad to trim the clip’s end point by the Nudge value.