Option+1 (on numeric keypad) Alt+1 (on numeric keypad) Option+2 (on numeric keypad) Alt+2 (on numeric keypad) Option+3 (on numeric keypad) Alt+3 (on numeric keypad) Option+0 (on numeric keypad) Alt+0 (on numeric keypad) Change Duration (in Event Operations window) Select/Split Notes (in Event Operations window) Command+8 (on numeric keypad) Ctrl+8 (on numeric keypad)