Korg MS20 Mini

SKU: KOR-KO-MS20MINI Categories: ,
Brands: Korg


MS-20 mini

Monophonic Analog Synthesizer

The classic MS-20 –recreated in mini size!

An analog synthesizer featuring the original circuitry from 1978

Korg’s MS-20 monophonic synthesizer, first introduced in 1978, is still a coveted instrument to this day, thanks to its thick, robust sound, its powerful, iconic analog filter, and its versatile patching options. Over 300,000 people have enjoyed the distinct MS-20 sounds from the original, from Korg’s MS-20 plug-in synth, or the iMS-20 iPad app.

Today, the sounds of the MS-20 have been reborn in hardware, as the MS-20 Mini. The same engineers who developed the original MS-20 have perfectly reproduced its circuitry and fit into a body that’s been shrunk to 86% of the original size, yet retains the distinctive look of the original.

The MS-20 mini will amaze you with its absolutely authentic analog synth sound.

Comments from the developers
Fifty years have passed since Korg was founded, and we have once again put our hand to an analog synthesizer. We took particular care to deliver smooth parameter adjustments, which are a distinctive feature of analog synthesizers. We also took special care to completely reproduce the original specifications of the MS-20. The analog circuits we designed 35 years ago still deliver the same unbeatable, powerful sound, from the ultra-low to the ultra-high range.


  • 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

The MS-20 mini painstakingly replicates the original MS-20. A development team led by the original engineers themselves worked to recreate the original circuitry, and when it was necessary to substitute a part, these engineers made the decisions based on careful listening, in order to reproduce the original sound faithfully. In fact, the sound of the MS-20 mini has a somewhat bright and extreme quality to it because its sound is that of an original MS-20 in mint condition at the time it went on sale, before any of the components aged.

2VCO / 2VCF / 2VCA / 2EG / 1LFO structure
The MS-20 mini reproduces the distinctive synthesis of the MS-20; two oscillators with ring modulation, and envelope generators with hold and delay. The VCA maintains the basic design of the original, but it’s been modified to produce less noise than the original.

Self-oscillating high-pass/low-pass filters with distinctive distortion
One of the greatest characteristics of the MS-20 was its powerful filters, which provided resonance on both the high-pass and the low-pass. Maximizing the resonance would cause the filter to self-oscillate like an oscillator, producing a distinctive and dramatic tonal change that was acclaimed as inimitable, and was later used on the monotron and monotribe. The filter circuit was changed mid-way through the production lifecycle of the MS-20; the MS-20 mini uses the earlier filter, which was felt to be superior due to its more radical sound.

External signal processor (ESP) for processing an external signal
The ESP carries on the experimental spirit of MS-20; it allows you to use the pitch or volume of an external audio source to control the synthesizer. For example you can input an electric guitar and use the MS-20 mini as a guitar synthesizer, or input a mic and use it as a vocal synthesizer.

Extremely flexible patching system
The patching system provided to the right of the panel lets you create complex sounds by plugging-in cables to change the connections between the various units. The possibilities are limited only by the user’s imagination; different combinations of the modulation input/output and trigger, sample and hold, and noise generator can produce an incredible variety of sounds. By patching according to the MS-20 flow chart that’s printed on the panel, even the beginner can start taking advantage of these possibilities right away.



< Control Section >


    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

Power switch and Volume:



    LED (KBD trigger, Modulation Generator rate, Power ON )

< 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 ?)

Head phones:

    Head phones output (Stereo 1/8″ mini phone jack, 33 ? 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:


Power Supply:


Dimensions (W x D x H): a

    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

Additional information

Weight 9.9999 kg