Digitally Controlled Phase Shift: Altering the
phase response of a signal without changing its
amplitude characteristics is commonly performed
using an all pass filter. This circuit
implementation is well suited to using digital
potentiometers as the controlling element.
Tone Display System: This device gives visual
feedback of which note you're playing, so you can
set up the note before bringing up the volume to
sound it. It features a 40-LED display, for over
three octaves of range at any given time.
Furthermore, a three-position switch extends the
range by two octaves, for a total usable range of
over five octaves.