MS-X Analogue Synth: An Extreme Korg Monotron Mod

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When KORG released the Monotron, a tiny monophonic synthesiser that looked like an old cassette tape, it was a synth that despite its size it punched well above its weight. With the embedded 12dB/oct lowpass filter of the MS-10/20 analogue synth., this was certainly a stroke of genius by KORG and offers the musicality of its bigger siblings.

Move forward  a few years and we now have a full monophonic analogue synthesizer built from a KORG Monotron called the MS-X by musician & instrument developer Far Beyond Perception. It offers all the classic controls for the VCO, VCF, ADSR, VCA… but there is one challenge however; this is DIY project that is not recommended for beginners but for the very experienced who are adept to wielding solder irons.

The schematics are available now for free on the DJ Soul Machine//Far beyond Perception website.


Voltage Controlled Oscillator (VCO):

– Scale: 32′, 16′, 8′, 4′

– Waveforms: Tri, Saw, Pulse (with PWM), VCO off

– Variable pitch control

– Glide control

– Sub Oscillator

Voltage Controlled low-pass Filter (VCF):

– Cutoff Frequency control

– Peak (Resonance) control

– Keyboard tracking switch

More information here: MS-X Synthesiser

Voltage Control Amplifier (VCA):

– MS10 VCA clone

– Feedback loop

Modulation Generator (MG):

– Waveforms: Triangle, Saw & Square

– Frequency control

– Frequency modulation of VCO & VCF

Envelope Generator (EG):

– Attack, Decay, Sustain, Release

– Frequency modulation of VCO & VCF

– Amplitude modulation of VCA


– CV/gate

– Drone mode

– Manual gate trigger

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