Korg Monotron Duo

A pocket-sized analog ribbon synthesizer with two VCOs and X-Mod circuitry

Overview

The Korg Monotron Duo is a compact analog synthesizer built around a ribbon controller keyboard, designed for immediate, tactile sound manipulation. It expands on the original Monotron concept by adding a second analog VCO and an X-Mod circuit that enables cross-modulation, a feature inspired by Korg’s early 1980s Mono/Poly synthesizer. This makes the Duo capable of more complex and evolving tones compared to its predecessor. Marketed as a palm-sized, battery-powered instrument, it’s built for portability and spontaneous play, fitting easily into a pocket and running without external power. The synthesizer includes a built-in VCF filter and a single headphone output for private monitoring or external signal routing.

Specifications

Manufacturer	Korg
Model	Monotron Duo
Product type	Analog Ribbon Synthesizer
Sound Generation	Analog
Oscillators	2 analog VCOs
Modulation Feature	X-Mod circuit
Keyboard Type	Ribbon controller
Power Source	Battery-powered
Audio Output	1 headphone output
Dimensions (D)	2.83"
Weight	0.21 lbs

Context

The Monotron Duo is one of three siblings that followed the original Korg Monotron, distinguished by the addition of a second VCO and X-Mod capabilities. Its cross-modulation feature draws direct inspiration from Korg’s classic Mono/Poly synthesizer from the early 1980s, linking this miniature synth to a larger legacy of analog design within the Korg lineup.