Future Retro Zillion Owner Manual - Manual (Page 15)

SCALE
There are 99 musical scales that limit what notes can play as generated
by the Melody algorithm. Scales 1 – 16 are presets, while scales 17 – 99
are user definable.
The top line of the display will show the name or user number of the
currently selected scale.
Each of the four soft keys can be used to select a different scale. This
allows you to instantly jump to different scale selections. The active scale
value will be indicated with a triangle next to the value.
The active scale value can be adjusted at any time using the +/- keys.
While holding any soft key you can then edit the scale value using the +/-
keys, or the touch pad. The new scale will take affect when the soft key
is released.