Erica Synths / BULLFROG

Bullfrog by Erica Synths and Richie Hawtin is an electronic music teaching instrument that appeals to both young people and professionals. This classic subtractive synthesizer has “modules” for sound generation and processing, and functions with patch cables and voice cards. The set includes the Bullfrog synthesizer and accessories.

■Learn, Create, Perform
Developed by Erica Synths and Richie Hawtin, Bullfrog is an educational electronic music instrument designed to inspire and engage both children and adults alike. Bullfrog invites you to unleash your musicality while combining the thrill of electronic music production with a comprehensive learning experience.



・Fully analog design

- High-precision voltage-controlled oscillator (VCO) that tracks over 8 octaves

- Manually adjustable voltage-controlled waveforms ? sine wave, shark fin, and pulse wave via pulse width modulation (PWM)

- Zener diode-based noise generator

- Resonant low-pass filter (VCF)

- Voltage controlled amplifier (VCA) with adjustable offset

- Delay effect with adjustable delay time and feedback amount

- Two looping attack, sustain and release envelope generators (EG)

- Sample & hold circuit with individual clock

- Manual gate button

- Voice card slot

Built-in speaker

DIN 5 MIDI input

USB connector

Dimensions: 40 x 385 x 210 mm

Weight: 1.8 kg

Bullfrog is a classic subtractive synthesizer. It consists of several “modules” for sound generation (VCO, NOISE GENERATOR) and processing (VCF, VCA/DELAY), and “modules” that generate control and modulation signals to control them (ENVELOPE GENERATORS). And a sample & hold. The Bullfrog does not generate sound on its own, unless you patch it by using Eurorack patch cables to interconnect the “modules” or by inserting a voice card that creates internal connections between the “modules” in a specific way and adds additional functions such as a sampler / looper, sequencer, groove box, etc. This approach helps you to better understand the functions of subtractive synthesis synthesizers and the principles of sound design for such instruments.



・BULLFROG synthesizer

・Universal 12VDC wall adapter

・User manual

・10 patch note stencils

・ 10 patch cables

・ 3 pre-patched voice cards: sequencer, acid bassline, sampler looper

・ 3 DIY voice cards