TC-Helicon HarmonyControl Guitar - Manual (Page 17)

Using the Key Footswitch
18
The Major and Minor 1, 2 & 3 scale variations
TC-Helicon and older Digitech® harmony processors
have slight variations of typical Major and Minor scales to
expand compatibility with more song chord structures and
melodies.
There are three Majors: Maj1, Maj2 and Maj3 and three
Minors: Min1, Min2, Min3. The differences between these
are evident only when singing certain notes in the scale but
they can make the difference between harmonies
sounding appropriate for a song or not. Detailing the exact
differences is beyond the scope of this manual but there
are definitions in the manuals for these products, and of
course your ears, to tell you when one scale works over
another.
With compatible processors, HarmonyControl allows you
to select among these variations through MIDI.