To raise or lower a note

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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.

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