Korg Ms20 mini synthesizer 
 
Main Specifications
Keyboard
C – C: 37-notes (3 octaves), mini keyboard designed specifically for the MS-20 mini
Manual controller
Control wheel (center click), 　 Momentary switch -->GND
Input and Output
Signal In: Amplifier Out, 
　 Band pass filter Out, 
　 CV Out (0 - +8.4V), 
　 ENV Out (0 - +5V), 
　 Trig Out (+5V-->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), 

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

MIDI: MIDI Input 
*Only note messages (velocity is not used) can be transmitted and received.
Power Supply
DC9V
Dimensions: 
(W x D x H)
493 ×257 ×208 mm / 19.41 x 10.12 x 8.19 inches
Weight
4.8 kg / 10.58 lbs.
Accessories
AC adaptor (9V/1.7A), Patch Cord x 10
Detailed Specifications
1. Keyboard
C – C: 37-notes (3 octaves), mini keyboard designed specifically for the MS-20 mini
2. 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
3. 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) 　 　
4. VCO Master control
Master tune (± 100cent) 
Portamento (max. 10sec) 
FFrequency modulation intensity by MG/T.EXT (-5V - +5V) 
Frequency modulation intensity by EG1/EXT (-5V - 0V) 　 　
5. VCO Mixer
VCO 1 Level 
VCO 2 Level
6. 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) 　 　 　
7. 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) 　 　 　
8. Envelope Generator 1
Delay time (10sec) 
Attack time (10sec) 
Release time (10sec) 　 　
9. Envelope Generator 2
Hold time (20sec) 
Attack time (10sec) 
Decay time (10sec) 
Sustain level (0V - 5V) 
Release time (10sec)
10. Modulation Generator (LFO)
Wave form (Positive Sawtooth - Triangle - Negative Sawtooth, Wide Pulse - Square - Narrow Pulse) 
Frequency (0.1Hz ～ 20Hz)
11. Manual controller
Cntrol wheel (center click) 
Momentary switch -->GND
12. Power switch and Volume
Volume
13. Indicator
LED (KBD trigger, Modulation Generator rate, Power ON)
Control Section
1. Control section
Input signal level 
Low cut frequency (50Hz - 2,500Hz) 
High cut frequency (100Hz - 5,000Hz) 
CV adjust 
Threshold level
2. Input and Output
Signal In 
Amplifier Out 
Band pass filter Out 
CV Out (0 - +8.4V) 
ENV Out (0 - +5V) 
Trig Out (+5V-->GND)
3. Indicator (LED)
Peak indicator 
Trigger indicator
External Signal Processor
1. Keyboard
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)
2. VCO
VCO-1 + VCO-2 external frequency control input (OCT/V) (-5V - +5V)
3. VCF
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)
4. VCO + VCF
Total external modulation input (T.EXT) (-5V - +5V)
5. VCA
External initial gain control input (0 - +5V)
6. EG
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)
7. MG
Triangle output (Positive Sawtooth - Triangle - Negative Sawtooth) (5Vp-p) 
Rectangle output (Wide Pulse - Square - Narrow Pulse)(0 - +5V)
8. Noise Generator
Pink noise output (5Vp-p) 
White noise output (5Vp-p)
9. Sample and Hold
Clock trigger input (-->GND) 
Sample signal input (5Vp-p max.) 
S/H output (5Vp-p max.)
10. Modulation VCA
Control voltage input (0 - +5V) 
Signal input (-5V - +5V) 
Signal output (-5V - +5V)
11. Manual controller
Control wheel output (-5V<--0V-->+5V) 
Momentary switch output (-->GND)
12. Signal out
Signal output (mono 1/8" mini phone jack, 2Vp-p output impedance 3.5k Ω)
13. Head phones
Head phones output (Stereo 1/8" mini phone jack, 33 Ω 48mW)
14. USB
Type B, USB-MIDI Input/Output 
*Only note messages (velocity is not used) can be transmitted and received.
15. MIDI
MIDI Input 
*Only note messages (velocity is not used) can be transmitted and received.
Patch Panel