- Double-click the Half Step Up Tool or Half 
 Step Down Tool; then click the note. Use the same technique to 
 add accidentals that raise or lower a note by two half steps (that is, 
 to double-flat or double-sharp a note).
 
            - CTRL click a note or enter a note with the caret, 
 and then press numpad + to increment up a half step or numpad - to increment 
 down a half step.