Wave folder with ring modulator


The RingFolder, from PM Foundations. This is a combination wave folder and ring modulator, with inputs for the folder (Z) and X and Y for the ring modulator.

The module takes a sine wave and can manually fold the incoming sine wave in either a soft/triangular effect or a hard/square/crunchy effect.

Electric guitars are easily within your reach with this powerful little module.

The attenuated input for folder modulation allows voltage control of the fold amount.

There is an onboard mixer, providing the ability to fold an input sine wave, the output of the ring modulator or a combination of the two.

Listen and watch the demo video which says it a lot better than these words! Thanks Randy.


This is a PCB and Panel set only. A set of 1 high quality PCB and 1 front panel ONLY are included. You will need to purchase your own components and build your own module. Comprehensive build instructions and BOMs are provided to help you source the components needed and we even provide links to shopping carts to simplify sourcing those components. Some product photos above show COMPLETED build.


  • Wave folder
  • Ring modulator
  • Separate folder and ring modulator outputs
  • CV input for fold amount
  • built in mixer/fader for panning between ring modulator and a third sine wave input
  • 6HP Eurorack with our panel


The following video, courtesy of Randy Piscione, shows the Ring Folder in action:

A demo of the Ring Folder - see and hear the Ring Folder's many capabilities


Comprehensive documentation, parts lists are provided in the documentation link for building, testing and calibrating the module.


  • ? mA +12V
  • ? mA -12V
  • ? mA 5V
  • 40 mm deep

Module is available as a DIY project only.

This Module is currently available.

$20 Price in € submitted Jul 1st 2019, 17:21 by jnfrench | last Change Nov 13th 2019, 06:28 by motorhead412

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