Low priority manual issue
in Section 6.2 of the manual you mention 'fifths' and 'sevenths'. A fifth is not +5 semitones, it's + 7 semitones.
A seventh is not +7 semitones, it's +10 semitones.
And, you spell the term 'semitone' - you don't need a dash in the middle.
cheers Jeff
