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Bullfrog Desktop Semi-Modular Synthesizer - Image 1

Bullfrog Desktop Semi-Modular Synthesizer

DesktopAnalogMonophonic

Born from a collaboration between Erica Synths and Richie Hawtin, this desktop synth reimagines subtractive synthesis as a hands-on playground, complete with swappable voice cards that instantly transform it from a blank canvas into a sequencer, acid bass machine, or sampler looper.

At its core sits a fully analog VCO that tracks superbly across eight octaves, offering CV-controlled waveshaping from sine-shark fin to PWM pulse, blended with a zener diode noise generator via a versatile mixer. A resonant 24dB/octave lowpass VCF pairs with a VCA that includes offset control and a built-in delay effect tweakable for time and feedback, all shaped by two looping ASR envelopes and a sample & hold with its own clock. Patch the 25 points with included cables or slot in one of the three pre-patched voice cards—plus DIY blanks—for instant sounds, while front-panel knobs, a manual gate button, and built-in speaker make experimentation effortless on its sturdy 385 x 210 x 40 mm frame weighing 1.8 kg. MIDI via DIN or USB-C, CV/Gate inputs, audio in/out, and headphones round out connectivity for desktop jamming.

Players love its intuitive path to synthesis basics, praising the fat analog tones and educational voice cards that hook beginners fast, though some note the monophonic voice keeps it focused on leads and bass rather than chords.

Released

Unknown

Status

In Production

Synthesizer
Format
Desktop, Semi-Modular
Type
Subtractive
Internal Battery
No
Voice
A/D
Analog
Polyphony
Monophonic
Oscillators
1
Oscillator Type
VCO (Voltage Controlled)
Voices
1
Filter
Lowpass, Resonant
Envelopes
2
LFO
1
Effects
Delay
Expression
Aftertouch
No
Velocity
No
MPE
No
Additional
25 patch points
Software
-
I/O
Audio In
1x 3.5mm TS
Audio Out
1x 3.5mm TS
Headphone
1
MIDI
In
MIDI Type
DIN (5-pin), USB
Ports
USB, CV/Gate
Wi-Fi
No
Workflow
Arpeggiator
No
Sequencer
Yes
Mod Matrix
No
Memory
16 presets
Measurements
Dimensions
385 x 210 x 40 mm
Weight
1.8 kg
Last updated Feb 26, 2026