Deleting Events in the MIDI Event List
To delete an event in the MIDI Event List:

Option-click (Mac) or Alt-click (Windows) the event you want to delete.
To delete a selection of events in the MIDI Event List:
1. Select the events you want to delete by either dragging in the Start column, or by Shift-clicking each event.
3. Do one of the following:

Choose
Edit > Clear to delete all selected events.

Press Delete (Mac) or Backspace (Windows) on the alphanumeric keyboard.