Chords expander for the Erthenvar Patch Chord.

The Chords is an expander for the Patch Chord, allowing you to select notes, sum them, and optionally gate them. There are 13 three way switches, which sum the lower octave output (left), mute (center), and sum the upper octave output (right). The Gate input is normalled to +5V, and enables the Chords output when the signal is high. When the Gate signal is low, the output is muted.