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MMO-3

Semi-ModularDigitalMonophonic

Imagine a compact digital synth that fuses West Coast experimentation with FM-style madness, delivering atonal soundscapes from three sine wave oscillators in a monophonic but stereo package. Released around 2017 and now a sought-after vintage piece, it invites you to twist conventional synthesis into wild, unpredictable timbres without needing a traditional filter.

At its core, the MMO-3 packs three oscillators with flexible shaper functions and wireless modular routing, letting you feed one osc back into another for feedback loops or auto-modulation. Modulation is where it shines: three unique LFOs—one with shape morphing from triangle to pulse, another using amplitude modulation on dual sines, and the third offering five modes like FM, steps, or triangles—plus a versatile ADSR envelope that can act as a gate, LFO, or assignable mod source for amplitude, pitch, or shapers. Hands-on control comes via 30 knobs, a joystick for real-time tweaks, stereo audio in/out, and MIDI input for notes, velocity, and pitch bend, all squeezed into a semi-modular desktop unit perfect for experimental rigs.

Synth enthusiasts praise its deep sound design playground for percussive hits, drones, and bizarre textures, though the lack of a display means programming relies on intuition and knob twiddling. If you're chasing unique, hands-dirty modulation without the complexity of full modulars, this one's a gem worth hunting down.

Released

2017

Status

Discontinued

Synthesizer
Format
Semi-Modular, Eurorack
Type
Digital, FM, West Coast
Internal Battery
No
Voice
A/D
Digital
Polyphony
Monophonic
Oscillators
3
Oscillator Type
Digital
Voices
1
Filter
No
Envelopes
1
LFO
3
Effects
Distortion
Expression
Aftertouch
No
Velocity
Yes
MPE
No
Additional
-
Software
-
I/O
Audio In
1x stereo (1/4" TRS)
Audio Out
1x stereo (1/4" TRS)
Headphone
-
MIDI
In
MIDI Type
DIN (5-pin)
Ports
CV/Gate
Wi-Fi
No
Workflow
Arpeggiator
No
Sequencer
No
Mod Matrix
Yes
Memory
-
Measurements
Dimensions
280 x 150 x 60 mm
Weight
620 g
Last updated Mar 17, 2026