Trimming MIDI Notes with Nudge
You can trim the start and end points of selected MIDI notes by the current Nudge value.
To trim the selected MIDI notes start or end points by the Nudge value:
2. With the Time Grabber tool, select the MIDI notes 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 start point of the selected MIDI notes by the Nudge value.

While pressing Command (Mac) or Control (Windows), press Plus (+) or Minus (–) on the numeric keypad to trim the numeric keypad to trim the end point of the selected MIDI notes by the Nudge value.