Erica Synths Launch Bullfrog XL

US Subtractive analog synthesizer combines the thrill of electronic music production with a comprehensive learning experience      16/05/24

Erica Synths has officially launched its Bullfrog XL subtractive analog synthesizer, an educational electronic music instrument. They say that Bullfrog, created by Erica Synths & Richie Hawtin, was designed to captivate and inspire both youth and professionals alike, combining the thrill of electronic music production with a comprehensive learning experience.
A spokesperson told us, "Bullfrog XL is designed specifically for teachers to use in front of the classroom, and it expands the concept of the regular Bullfrog by inflating its size by a factor of three. With its expanded size and built-in oscilloscope, Bullfrog XL isn't just for classrooms but is sure to be a great addition to any studio."

Here's the details direct from Erica Synths...


  • Fully analog design
  • Highly accurate voltage controlled oscillator (VCO) that tracks great over 8 octaves
  • Manually adjustable and voltage controlled waveshapes - sine-shark fin and pulse wave with pulse width modulation (PWM)
  • Zener diode-based noise generator
  • Resonant lowpass voltage controlled filter (VCF)
  • Voltage controlled amplifier (VCA) with adjustable offset
  • Delay effect with adjustable delay time and feedback amount
  • Two looping attack-sustain-release envelope generators (EG)
  • Sample & Hold circuit with an individual clock
  • Attenuverter and two buffered splitter circuits
  • Slew processor with adjustable slew time
  • Two channel oscilloscope
  • 6.3 mm jack sockets
  • Manual gate button, Gate and Trigger out
  • Voice card slot
  • Built in speakers
  • DIN5 MIDI input and USB connector
  • Dimensions (mm): 820 x 505 x 65 (250 with the side panels)


Bullfrog is a classical subtractive synthesizer. It consists of several "modules" for sound generation (VCO, Noice Generator) and treatment (VCF, VCA/Delay), as well as "modules" that generate control and modulation signals to control them (Envelope Generators and Sample & Hold). The Bullfrog will not make the sound on its own unless it is patched using Eurorack patch cables to interconnect the "modules", or by inserting voice cards that create internal connections between the "modules" in a specific way and add extra functionality - such as the Sampler/Looper, Sequencer, Groovebox, etc. This approach better helps to understand the functionality of a subtractive synthesizer and the principles of sound design with instruments like these.

What's included:

  • BULLFROG XL synthesizer with side-panels
  • Universal 12VDC wall wart adapter with the power cable
  • User manual
  • 12 1/4" patch cables
  • Sequencer, Sampler/Looper, Acid Bassline, Hipass filter, LFO and Electric Organ Voice cards
  • 3 DIY voice cards


In order to provide a well-rounded understanding of the functionality of this synthesizer and sound synthesis in general, a comprehensive user manual is created to accompany the learning process.

Pricing and Availability:
Bullfrog XL is available now and priced at €1,700.

More information:


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