Modules for Voltage Modular

Poly Mux

What's better than switching one poly input? Yes - switching two of them at the same time! And all in lovely purple.


Poly Mux is a ten-to-one multiplexer that selects one of ten pairs of poly inputs and sends those signals to a pair of poly outputs. The switching can be controlled by a pitch signal or by an arbitrary voltage. The switching methods are mutually exclusive - you can only use one method at a time. It was designed to partner with the Mini Chord module but it will find many other uses as a general purpose polyphonic utility. Oh, and if a ten-to-one multiplexer feels a bit early then I guess you could consider it to be a twenty-to-two multiplexer...



This input takes a standard 1V/octave pitch signal and uses it to select one of the input pairs. In this mode each of the ten input pairs is labelled with the input note required to select it, from C to A in whatever octave you have set. A note outside of that range deselects everything. The LEDs show which pair is currently connected to the output. Making a connection to this input disables the CV input and associated controls.


This input uses a voltage to select an input pair according to the Min and Max knobs. By default the range is set at 0V to 5V so the ten inputs are selected in increments of 0.5V but any range from -10V to +10V can be set. A voltage outside of the range deselects everything. Each of the inputs is labelled with the mid point of the switching voltage for that input. So, for example, with the default 0 to 5V range, input 1 will be labelled as "0.25V" and will be selected with a signal of 0.0V to 0.5V. The LEDs show which pair is currently connected to the output. Making a connection to this input disables the Pitch input and associated control.

Poly Input pairs

These are the ten pairs of inputs. Only one pair can be selected at a time. An out of range control signal deselects all of the inputs.


Pitch and Gate

These are the two ouputs. If a valid input pair is selected then these outputs mirror the signals from that input pair.



Selects the octave for the pitch input. The labels on the inputs are updated accordingly.

Min and Max

These set the input voltage range for the CV input. Max can be set from 0V to +5V, Min can be set from -5V to 0V. If you get curious and decide to set both Min and Max to 0V nothing will be selected. But I bet you still try it!

Mini Chord with Poly Mux

The inspiration for Poly Mux and Mini Chord was the desire for a simple way to generate and sequence chords. A typical setup is to have, say, four Mini Chord modules, each set to one chord from your desired progression or scale. These feed into Poly Mux and the chords can be played live from a MIDI keyboard, sequenced with a step sequencer or, using the CV input, controlled by an LFO or similar. It can be fun to feed it with a random (sample and hold) LFO signal. Chaining the chord into PoMo Spreader lets you get at the individual notes, octave shift them and drive basslines and other mono instruments alongside the chords.