Korg MS-20 Kit - Monophonic Analog Synthesizer Kit

Korg MS-20 Kit - Monophonic Analog Synthesizer Kit

Korg MS-20 Kit - Monophonic Analog Synthesizer Kit

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Expected availability: 7-14 business days

Product Highlights

  • Replica of Original in Kit Form
  • Assembly Only, No Soldering Required
  • 37 Keys
  • Flexible Patching System
  • 2 Oscillators
  • Ring Modulator on Oscillator 2
  • Envelope Generators with Hold and Delay
  • Self-Oscillating High-/Low-Pass Filters
  • External Signal Processing
  • MIDI In and USB MIDI
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Korg MS-20 overview

  • 1Description

The MS-20 Kit from Korg is a kit for self-assembling a real MS-20 synthesizer according to the directions given in the owner's manual. Assembly does not require knowledge of soldering or electronic circuitry, since most of the steps consist of simply tightening screws or fitting parts together. The MS-20 Kit is a full-size unit with a standard-sized keyboard, and full sized 1/4" phone plugs.

A development team led by the original engineers strove to painstakingly replicate the MS-20, both in sound and form. The sound comes from an architecture featuring two oscillators (one with ring modulation) and envelope generators with hold and delay. The VCA (Voltage Controlled Amplifier) maintains the basic design of the original.

The original MS-20 used different VCF circuits depending on the date of production, with earlier units featuring a filter noted for its distinctive distortion and self-oscillation, while the filters used in later units had a low-noise design with a mellower character. The kit includes both filters allowing you to switch between the two by moving a jumper on the circuit board.

The External Signal Processor (ESP) allows for using the pitch or volume of an external audio source to control the synthesizer. You can input an electric guitar and use the MS-20 kit as a guitar synthesizer, or connect a microphone for use as a vocal synthesizer. A flexible patching system is provided that allows for creating different modulation routing, and by following the front panel printed flow chart, even beginners can take advantage of these patching possibilities right away.

The synthesizer features a MIDI In jack for receiving note messages, and a USB-MIDI connector that can transmit and receive note messages (there is no velocity information). Connecting the unit to a computer allows it to be triggered from a sequencer.

Full-size MS-20 that you can easily assemble yourself
Both the early and late versions of the filter are provided
Overseen by the engineers of the original MS-20
Complete replication of the original analog circuitry including 2 x VCO, 2 x VCA, 2 x VCF, 2 x EG, 1 x LFO structure
External signal processor (ESP)
Extremely flexible patching system
MIDI In and USB connector
Powered by an AC adapter
Replicates every detail of the original, down to the package binding and the included manual
In the Box
Korg MS-20 Kit - Monophonic Analog Synthesizer Kit
  • External Power Supply
  • 10 x Patch Cables
  • 213 x Components
  • One (1) Year Limited Warranty on Components
  • Table of Contents
    • 1Description

    Korg MS-20 specs

    Keyboard 37-note keyboard
    Main Controller Control wheel (center click)
    Momentary switch -->GND
    Polyphony Monophonic
    Multitimbral No
    Synthesis Method Voltage controlled analog
    Control Section Voltage Controlled Oscillator 1 (VCO 1)
    Scale: 32, 16, 8, 4' (6 octaves, +cent, -cent)
    Waveform: Triangle, Sawtooth, PW-Square, White Noise, (x 4 modes)
    Pulse Width Adjust: 1:1 to 1:Infinity

    Voltage Controlled Oscillator 2 (VCO 2)
    Scale: 16, 8, 4, 2' (6 octaves, +cent, -cent)
    Waveform: Sawtooth, Square, Pulse, Ring Modulator, (x 4 modes)
    Pitch: +/-1 Octave

    VCO Master Control
    Master Tune: +/- 100 cents
    Portamento: Maximum 10 s
    Frequency Modulation Intensity by MG/T.EXT: -5V to +5V
    Frequency Modulation Intensity by EG1/EXT: -5V to 0V

    VCO Mixer
    VCO 1 Level
    VCO 2 Level

    Voltage Controlled High Pass Filter (VCF HPF)
    Cutoff Frequency: 50 Hz to 15 kHz
    Peak: Flat to self OSC
    Cutoff Frequency Modulation Intensity by MG/T.EXT: -5V to +5V
    Cutoff Frequency Modulation Intensity by EG2/EXT: -5V to +5V

    Voltage Controlled Low Pass Filter (VCF LPF)
    Cutoff Frequency: 50 Hz to 15 kHz
    Peak: Flat to self OSC
    Cutoff Frequency Modulation Intensity by MG/T.EXT: -5V to +5V
    Cutoff Frequency Modulation Intensity by EG2/EXT: -5V to +5V

    Envelope Generator 1
    Delay Time: 10 s
    Attack Time: 10 s
    Release Time: 10 s

    Envelope Generator 2
    Hold Time: 20 s
    Attack Time: 10 s
    Decay Time: 10 s
    Sustain Time: 10 s
    Release Time: 10 s

    Modulation Generator (LFO)
    Waveform: Positive Sawtooth - Triangle - Negative Sawtooth, Wide Pulse - Square - Narrow Pulse
    Frequency: 0.1 Hz to 20 Hz

    Manual Controller
    Control Wheel (center click)
    Momentary Switch --> Ground

    Power switch and Volume

    Keyboard Trigger LED
    Modulation Generator Rate LED
    Power On LED
    External Signal Processor Control Section
    Input Signal Level
    Low Cut Frequency: 50 Hz to 2.5 kHz
    High Cut Frequency: 100 Hz to 5 kHz
    CV Adjust
    Threshold Level

    Input and Output
    Signal In
    Amplifier Out
    Band Pass Filter Out
    CV Out: 0 to +8.4V
    ENV Out: 0 to +5V
    Trig Out: +5V --> Ground

    Peak Indicator LED
    Trigger Indicator LED
    Patch Panel Keyboard
    Keyboard Control Voltage Output (Exponential): 0 to +8V
    Keyboard Trigger Output: +5V --> Ground
    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 to +5V

    External Signal Input: 3Vp-p maximum
    External High Pass Filter Cutoff Frequency Control Input (2 Oct/V): -5V to +5V
    External Low Pass Filter Cutoff Frequency Control Input (2 Oct/V): -5V to +5V

    VCO + VCF
    Total External Modulation Input (T.EX): -5V to +5V

    External Initial Gain Control Input: 0 to +5V

    EG 1 Envelope Signal Normal Output: -5V to 0V
    EG 1 Envelope Signal Reverse Output: +5V to 0V
    EG 1 + EG 2 Trigger Input: --> Ground
    EG 1 Trigger Input: --> Ground
    EG 2 Envelope Signal Reverse Output: +5V to 0V

    Triangle Output: Positive Sawtooth - Triangle - Negative Sawtooth (5Vp-p)
    Rectangle Output: Wide Pulse - Square - Narrow Pulse (0 to +5V)

    Noise Generator
    Pink Noise Output: 5Vp-p
    White Noise Output: 5Vp-p

    Sample and Hold
    Clock Trigger Input: --> Ground
    Sample Signal Input: 5Vp-p maximum
    S/H Output: 5Vp-p maximum

    Modulation VCA
    Control Voltage Input: 0 to +5V)
    Signal Input: -5V to +5V
    Signal Output: -5V to +5V

    Manual controller
    Control Wheel Output: -5V <-- 0V --> +5V
    Momentary Switch Output: --> Ground
    Connectors 1 x 1/4" TS Signal Output (2Vp-p, output impedance 3.5kΩ)
    1 x 1/4" TS External Signal Input
    1 x 1/4" TRS Headphone (33Ω 48mW)
    12V DC
    1 x 5-pin DIN MIDI In*
    1 x USB Type B**
    * Only note messages received (velocity not used)
    ** Only note messages transmitted and received (velocity not used)
    Power Requirements 12V DC via included external power supply
    9W consumption
    Dimensions (WxDxH) 22.6 x 12.4 x 9.8" (573 x 316 x 248 mm)
    Weight 13.9 lb (6.3 kg)

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