Erica Synths Bullfrog — analog educational synthesizer

Developed by Erica Synths and Richie Hawtin, Bullfrog teaches synthesis through hands-on patching. Cables and voice cards reveal how sound sources, filtering and modulation work together.

Technical specifications

• Synthesis: Analog subtractive synthesis.
• Sound sources: VCO and noise generator.
• Processing: Low-pass VCF, VCA and delay.
• Modulation: 2 ASR envelopes and sample & hold.
• Voice cards: Interchangeable routing/function cards.
• Connections: DIN MIDI input and USB.
• Included: 10 cables, 3 voice cards and 3 DIY cards; adapter.
• Audio: Built-in speaker.
• Dimensions: 40 × 385 × 210 mm.
• Weight: 1.8 kg.