158: Keyboard shortcuts - 'N' key no longer works

The original version of Sibelius used the N key to build chords when inputting notes alphabetically. In subsequent versions, the N key has been replaced with the keys 1-9 (on the main keyboard) which add intervals of a unison to a ninth above the selected note/chord. N is equivalent to the new key 3, which adds a third above. To turn a note or even a selected passage into octaves, just type 8. Shift-2-9 add intervals of a second to a ninth below the selected note/chord. Shift-A-G add the specific note name above the note/chord.