the scale selected is chromatic, then pressing the +1 button repeatedly steps through all
twelve notes of the scale. But one can move forwards by two, or backwards by three,
etc. So one can imagine that the twelve notes are the numbers on the face of a clock,
and one is moving around the clock by jumping forwards and backwards from number to
number.
▲
(Left Shift) and
▼
(Right Shift) buttons
These decrement/increment through the 4 menus. Press and hold each one or the
other to bring up various screen options as well.
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