Bullfrog XL

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Bullfrog invites you to unlock your musicality while combining the thrill of electronic music production with a comprehensive learning experience. 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 3 (literally!). With its expanded size and built-in oscilloscope, Bullfrog XL isn't just for classrooms but will be a great addition to any studio.


  • 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
  • Slew processor with adjustable slew time
  • Two buffered splitter circuits
  • Two channel oscilloscope
  • 6.3 mm jack sockets
  • Manual gate button
  • Gate and Trigger out
  • Voice card slot
  • Built in speakers
  • DIN5 MIDI input
  • USB connector
  • Keyhole slots on the rear panel
  • Dimensions (mm): 820x505x65 (250 with the side panels)
  • Mass: 8.3 kg

What’s included:

  • BULLFROG XL synthesizer with sidepanels
  • 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

Created by Erica Synths & Richie Hawtin, Bullfrog is an educational electronic music instrument designed to captivate and inspire both youth and professionals alike. Bullfrog invites you to unlock musicality while combining the thrill of electronic music production with a comprehensive learning experience.

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.

Learn more on designated Bullfrog website 

Manuals book