KorgMS-20 Mini Semi-Modular Analog Keyboard Synthesizer


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Korg MS-20 Mini

Korg’s MS-20 Mini is a compact re-release of their legendary MS-20, first released in 1978. The MS-20 Mini’s circuitry is a faithful reproduction of the original, the only major change is that the mini’s size is a mere 86% of that of its predecessor. Additionally, the unit features a MIDI IN and USB connectivity for external synchronization.

For integration into a modular set-up, check out The Harvestman English Tear. The English Tear achieves effortless conversion of V/Oct signals into Hz/V signals recognized by the MS-20 and vice versa. Additionally, the module also converts V- and S-Triggers and affords the ability to scale all input voltages in accordance with the synthesist’s personal taste. (NOTE: The Harvestman English Tear is sold separately.)

MS-20 Mini Features

  • Overseen by the engineers of the original MS-20, a complete replication of the original analog circuitry
  • 2VCO / 2VCA / 2VCF / 2EG / 1LFO structure
  • Self-oscillating high-pass/low-pass filters with distinctive distortion
  • External signal processor (ESP)
  • Extremely flexible patching system
  • Miniature MS-20 that's 86% of the original size
  • MIDI IN and USB connector
  • Replicates every detail of the original, down to the package binding and the included manual


  • C - C 37-notes (3 octaves), mini keyboard designed specifically for the MS-20 mini

Voltage Controlled Oscillator 1 (VCO 1)

  • Scale (32', 16', 8', 4') (6 octaves, +cent, -cent)
  • Wave form (Triangle, Sawtooth, PW-Square, White Noise) (4 modes)
  • Pulse width adjust 1:1 - 1:infinity

Voltage Controlled Oscillator 2 (VCO 2)

  • Scale (16', 8', 4', 2') (6 octaves, +cent, -cent)
  • Wave form (Sawtooth, Square, Pulse, Ring modulator) (4 modes)
  • Pitch (± 1 octave)

VCO Master control

  • Master tune (± 100cent)
  • Portamento (max. 10sec)
  • Frequency modulation intensity by MG/T.EXT (-5V - +5V)
  • Frequency modulation intensity by EG1/EXT (-5V - 0V)

VCO Mixer

  • VCO 1 Level
  • VCO 2 Level

Voltage Controlled High Pass Filter (VCF HPF)

  • Cutoff frequency (50Hz - 15,000Hz)
  • Peak (flat - self OSC)
  • Cutoff frequency modulation intensity by MG/T.EXT (-5V - +5V)
  • Cutoff frequency modulation intensity by EG2/EXT (-5V - +5V)

Voltage Controlled Low Pass Filter (VCF LPF)

  • Cutoff frequency (50Hz - 15,000Hz)
  • Peak (flat - self OSC)
  • Cutoff frequency modulation intensity by MG/T.EXT (-5V - +5V)
  • Cutoff frequency modulation intensity by EG2/EXT (-5V - +5V)

Envelope Generator 1

  • Delay time (10sec)
  • Attack time (10sec)
  • Release time (10sec)

Envelope Generator 2

  • Hold time (20sec)
  • Attack time (10sec)
  • Decay time (10sec)
  • Sustain level (0V - 5V)
  • Release time (10sec)

Modulation Generator (LFO)

  • Wave form (Positive Sawtooth - Triangle - Negative Sawtooth, Wide Pulse - Square - Narrow Pulse)
  • Frequency (0.1Hz - 20Hz)

Manual controller

  • Control wheel (center click)
  • Momentary switch -->GND

External Signal Processor

Control section

  • Input signal level
  • Low cut frequency (50Hz - 2,500Hz)
  • High cut frequency (100Hz - 5,000Hz)
  • CV adjust
  • Threshold level

Input and Output

  • Signal In
  • Amplifier Out
  • Band pass filter Out
  • CV Out (0 - +8.4V)
  • ENV Out (0 - +5V)
  • Trig Out (+5V-->GND)

Indicator (LED)

  • Peak indicator
  • Trigger indicator

Patch Panel


  • Keyboard control voltage output (Exponential) (0 - +8V)
  • Keyboard trigger output (+5V-->GND)
  • VCO-1 + VCO-2 control voltage input (Linear response)(0 - +8V)
  • VCO-2 control voltage input (Linear response) (0 - +8V)


  • VCO-1 + VCO-2 external frequency control input (OCT/V) (-5V - +5V)


  • External signal input (3Vp-p max.)
  • External High pass filter cutoff frequency control input (2OCT/V) (-5V - +5V)
  • External Low pass filter cutoff frequency control input (2OCT/V) (-5V - +5V)


  • Total external modulation input (T.EXT)(-5V - +5V)


  • External initial gain control input (0 - +5V)


  • EG 1 envelope signal normal output (-5V - 0V)
  • EG 1 envelope signal reverse output (+5V - 0V)
  • EG 1 + EG 2 trigger input (-->GND)
  • EG 1 trigger input (-->GND)
  • EG 2 envelope signal reverse output (+5V - 0V)


  • Triangle output (Positive Sawtooth - Triangle - Negative Sawtooth) (5Vp-p)
  • Rectangle output (Wide Pulse - Square - Narrow Pulse)(0 - +5V)

Noise Generator

  • Pink noise output (5Vp-p)
  • White noise output (5Vp-p)

Sample and Hold

  • Clock trigger input (-->GND)
  • Sample signal input (5Vp-p max.)
  • S/H output (5Vp-p max.)

Modulation VCA

  • Control voltage input (0 - +5V)
  • Signal input (-5V - +5V)
  • Signal output (-5V - +5V)

Manual controller

  • Control wheel output (-5V<--0V-->+5V)
  • Momentary switch output (-->GND)

Signal out

  • Signal output (mono 1/8" mini phone jack, 2Vp-p output impedance 3.5k Ω)

Head phones

  • Head phones output (Stereo 1/8" mini phone jack, 33 Ω 48mW)


  • Type B, USB-MIDI Input/Output
  • Only note messages (velocity is not used) can be transmitted and received.


  • MIDI Input
  • Only note messages (velocity is not used) can be transmitted and received.

Power Consumption

  • 9W

Power Supply

  • DC9V

Dimensions (W x D x H)

  • 493 ×257 ×208 mm / 19.41 x 10.12 x 8.19 inches


  • 4.8 kg / 10.58 lbs.


  • AC adaptor (9V/1.7A), Patch Cord x 10
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