Bullfrog synthesizer is an educational electronic music instrument

Created by Erica Synths & Richie Hawtin. Instrument is designed to captivate and inspire both youth and professionals alike. Combining the thrill of electronic music production with a comprehensive learning experience, this instrument feels at home anywhere from a kids’ playroom, as an educational tool in music and physics classes, as an addition to your studio or even as a performance tool on a stage.
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learn produce perform Bullfrog


voltage controlled oscillator (VCO)

Analogue VCO with CV controlled waveshapes

noise generator and mixer

Noise generator and mixer with external inputs

voltage controlled filter (vcf)

AS3109 based VCF

voltage controlled amplifier (vca)

Logarithmic VCA with delay effect

envelope generators

Two looping envelope generators

sample & hold

Gated or free running Sample and Hold


Voicecard slot for extra features - sequencer, sampler/looper, groovebox, more filters, electric organ, etc; voicecard slots.

This synth will take you on a journey through time, on a trip to the galactic corners of sound exploration and possibly even to rooms within your own imagination that you hadn’t found keys to before!

what’s included

  • BULLFROG synthesizer
  • Universal 12VDC wall wart adapter
  • User manual
  • 10 patch notes stencils
  • 10 patch cables
  • 3 pre-patched voice cards
  • 3 DIY voice cards
Bullfrog - What's included

how the bullfrog works

In order to fully understand the functionality of this synthesizer, let’s take a closer look at the individual “modules” and let’s try them in action!
Bullfrog Schema