When multiple notes are selected, you can enter values in the Event Edit area fields to affect all selected notes. A triangle (delta symbol) to the left of the displayed note indicates that multiple notes are selected.
A new value in the Start field moves the first note in the selection to that location, with all other notes moving with it.
Values entered in the pitch and velocity fields add to or subtract from the values for all selected notes. For example, to transpose all selected notes down an octave, enter a value of –12 for pitch.