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Sub DecaySKU: 1007940

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A ring modulator with the soul of a synthesizer

A ring modulator that is easy to use, even live.

A ring modulator with a synthesizer soul. Prepare yourself for the Vitruvian Mod. Inspired by additive synthesis and set apart from other ring modulators by its pitch detection capabilities and the ability to be tuned by site, the Vitruvian Mod is a ring modulator you can love.

What is ring modulation?

Ring Modulators multiply two signals (input and carrier.) The end result is the sum and difference of the two frequencies. While the math is simple the results are often dissonant and unmusical.

Most ring modulators are simply hard to use. There are interesting sounds to be created, but controlling the effect is often a chore, especially dialing it in live. It’s not the type of effect which can haphazardly set and expect predictable results. Sometimes you just want to plug in and play.

We set out to solve the usability issues, but not limit the range of the effect. This is where the entropy switch comes in. It is an ‘ease of use’ toggle. Set to either order or chaos this switch alters the functionality of the carrier and fine tune knobs.

Pitch detection

One of the interesting ways to use a ring modulator is to tune it to add harmonic tones. With a traditional ring modulator this only works with a few notes. Other notes will render varying levels of unmusical dissonance. We added pitch detection and the ability to offset the carrier from the input. The offsets are based on harmonic ratios, creating interesting harmonic structures to everything you play.

Fixed Carrier modulation

Classic ring modulation sounds are available as well by setting the tracking switch to null 0. Unlike the typical coarse/fine tune arangement, the Vitruvian Mod’s carrier knob has seven fixed steps. When the entropy switch is set to order the carrier knob steps through the notes E A D G B E A. Perfect for guitar! The fine tune knob can detune the carrier up or down by a minor third. With the entropy set to Chaos there are eight octaves of range from ~19Hz to ~2.5kHz.

We designed the effect so that even if you don’t understand what it does the controls feel natural and intuitive.

For best results:

We recommend using the Vitruvian Mod early in your signal chain. Running overdrives and fuzzes after the Vitruvian Mod can really bring out the effect’s harmonic structure. Add a wah pedal after the Vitruvian Mod for synthesizer like effects. For leads try adding delay and modulation.

Using a compressor in front of the Vitruvian Mod will add sustain.

Control Matrix

  • Entropy switch – Set to order for ease of use. Set to chaos for wider range.
  • Tracking switch – Set to HI or LO for tracking modes. Set to null (0) for fixed carrier mode.
  • Carrier – Controls the internal carrier in seven fixed steps dependant on entropy and tracking settings.
  • Fine – Used to fine tune internal carrier dependant on entropy and tracking settings.
  • Modulation – Adjust the amount of ring modulation. Turn to the left for fully clean. Turn to the right for fully modulated.
  • Volume – Overall output of the effect
  • VM-intervals

* Based on Just intonation.


  • Design- Brian Marshall, Tom Eddleman
  • Code- Tom Eddleman
  • Artwork- Greg Schober
  • Original pitch tracking algorithm developed by Don Stavely.


About The Vitruvian Mod:

  • Powered by a regulated 9VDC to 18VDC adaptor with a negative center 2.1mm barrel style plug.
  • If using a “daisy chain” power supply, all other pedals MUST be negative ground.
  • Current draw is less than 100mA.
  • Length 4.4″ X Width 2.3″ X Height 1.0″
  • Input impedance- 500K.
  • Output impedance- ~5K.
  • The Vitruvian Mod is hand made in Oregon.
  • Die cast metal enclosures for durability.
  • 3PDT switches for true bypass switching.
  • Red LED indicator.
  • Three-year limited warranty.
Weight 12 oz
Dimensions 4.375 x 2.375 x 2.25 in

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