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.

The Bullfrog is a classical subtractive synthesizer – it consists of several “modules” for sound generation, as well as “modules” that generate control and modulation signals to control them. The Bullfrog will not make the sound on its own unless you make patches – use patch cables to interconnect the “modules” or insert voice cards that create internal connections between the “modules” in a specific way.

The modules:

• 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
  
• control voltage (cv) sources
  
• envelope generators
  Two looping envelope generators
  
• sample & hold
  Gated or free running Sample and Hold
  
• divider
• voicecards
  Voicecard slot for extra features - sequencer, sampler/looper, groovebox, more filters, electric organ, etc; voicecard slots.
  
• midi implementation and configuration

Features

• Fully analogue 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
• Manual gate button
• Voicecard slot
• Built in speaker
• DIN5 MIDI input
• USB connector
• Dimensions: 40 x 385 x 210 mm
• Weight: 1.8 kg

What's in the box:

• BULLFROG synthesizer
• Universal 12VDC wall wart adapter
• User manual
• 10 patch cables
• 3 pre-patched voice cards: Sequencer, Acid Bassline, Sampler Looper
• 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.