Korg MS-10 (1978)
One oscillator, one filter, one envelope - and the rawest tone Korg ever put in a patchable box.
Overview
The MS-10 is a entry-level model that doesn't sound like one. Released in 1978 as the smaller half of Korg's initial MS-series, it has a single voltage-controlled oscillator, a single voltage-controlled filter, a single voltage-controlled amplifier, plus envelope and modulation controls - and nothing else. No presets, no memory, no MIDI, no USB, no audio input, no pedal jacks. It has thirty-two full-sized synth-action keys with no touch sensitivity and no aftertouch, runs on AC power, and has no built-in speakers. What's left is real-time editing via front-panel knobs and a patch panel, and a tone that owners and reviewers alike describe as aggressive and character-rich in a way that defined early Korg synthesis.
Korg positioned it as the affordable alternative to the more expensive American synths coming from Moog and ARP. Patchable analog synthesis had been a rich musician's game, and the MS-10 helped bring it to a broader market without stripping out the patching. It's a no-frills monosynth in the most literal sense. Collectors who've spent time on both it and its famous sibling tend to describe it as a simple synth with a really nice raw tone.
The architecture is minimal: one VCO, one VCF, one LFO, one ADSR envelope. The VCO does have pulse width modulation, which the bigger MS-20 doesn't. So the little brother isn't simply a subtraction. There's at least one thing it does that the flagship can't.
Key Features
The Korg 35 Low-Pass Filter
The MS-10 carries the same low-pass filter found in the first-generation MS-20 - the Korg 35. That's the filter people mean when they talk about the early MS sound, and it's the reason the MS-10 gets pulled into conversations about synths costing several times more. Korg changed the filter design in the second generation of the MS-20, so the MS-10's filter is a specific slice of the lineage rather than a generic "MS-style" circuit.
Patchable, Semi-Modular Architecture
The front panel is covered in knobs and patch points, and the instrument is routinely described as semi-modular. One eBay listing goes so far as to call it a "Semi-Modular Synthesizer." A period classified ad from Electronic Soundmaker (March 1984) billed it plainly as a "patchable monophonic single oscillator synth," which is exactly right. The manual controller includes a control wheel capable of outputting -5V to +5V, and there's a signal out output for external modulation. External control runs through the voltage outputs. This separates it from a preset monosynth: you can wire it into a larger system. Korg's own documentation for the MS-20 describes patching the MS-10 in to thicken a sound. You feed the MS-20's keyboard CV and trigger outputs into the MS-10's VCO CV and trigger inputs so both synths track one keyboard, then detune one slightly for a phase or jet effect.
One VCO with Pulse Width Modulation
A single oscillator keeps the MS-10 simple. You're not stacking voices or detuning oscillators against each other. You shape one source and lean on the filter and envelope to do the rest. The pulse width modulation gives the VCO a bit of motion the MS-20 can't match. Owners looking for thick unison stacks should look elsewhere. Players looking for a lean, vocal, easily-filtered mono line will find the single VCO plenty.
32 Full-Sized Synth-Action Keys
Thirty-two keys, full-sized, synth-action, no velocity and no aftertouch. That's a two-and-a-bit-octave span with nothing between your fingers and the circuit - no sensing, no expression, no compensation. The manual controller's wheel is where the performance gesture comes from, and the -5V to +5V range gives it real authority over whatever it's patched to.
No MIDI, No Memory, No Compromise
The MS-10 lacks MIDI, USB, audio input, and pedal connectors, and it runs on AC power with no battery option. There's no patch memory because there's no digital anything. Every sound exists until you move a knob. That's a limitation if you gig a setlist of presets. A service manual with a structural diagram exists, which is more than can be said for plenty of its contemporaries. Collectors chasing documentation will find both a KORG MS-10 Service Manual and Korg MS-10 Service Notes in circulation.
Historical Context
The MS-10 arrived in 1978 as part of Korg's MS-series launch alongside the MS-20. It followed the company's 1973 miniKORG 700, Korg's first push into the analog synthesizer market. The family structure is well documented: the MS-10 is the smallest building block, the MS-20 is the big brother with the legendary filter, and the system extends to the MS-50 extension module and a sequencer. Korg's own materials and contemporary coverage treat the MS-10 as the cutdown version of the MS-20 - one VCO, one VCF, one envelope generator where the MS-20 has more of everything.
Writing in March 1984, Electronic Soundmaker & Computer Music (p.8) noted that the MS-10 and MS-20 were two of the most successful products in the field of mono synths, both having been around for some five years and continuing to serve as an ideal entrée into the world of synthesizers. A classified in the same publication listed the MS-10 at £195 - competitive against the Moog and ARP instruments it was built to undercut.
Collectibility & Value
The MS-10 trades steadily rather than spectacularly. eBay completed sales as of October 2026 show a high of $1,120, a median of $879, and a low of $651, with the latest sale at $721 - roughly one unit moving per month, based on four completed sales over the past twelve months. Those figures exclude accessories, parts, and non-working units, so they reflect instruments that actually play. Active listings have been observed at $654, $750, $800, and $950, and Equipboard lists prices from $779.99. The spread between the low and high comes down to condition, completeness, and whether the unit has been serviced.
Condition matters more than the price chart. An owner report on Gearspace describes finding one on Facebook Marketplace in a pile of other gear - cracked case, filthy, needing some love. A for-sale listing at the other end of the spectrum advertised good cosmetic condition and superb working order, fully serviced and calibrated by a specialist. The MS-10 is old enough that "works" and "works properly" are different claims. Service documentation is available, but the fact sheet carries no common-failure or spare-parts data, so budget for a technician's bench time and inspect the case and patch panel carefully before buying. At current prices, a serviced example at the median is the sensible buy. A project unit at the low end only makes sense if you have someone who can bring it back.
Market Value
┌──────────────────────────────────────────────────────────────────────────┐ │ KORG MS-10 Nov 2026 │ ├──────────────────────────────────────────────────────────────────────────┤ │ High $1,120 Latest $721 │ │ Median $879 Trend — │ │ Low $651 Volume ~1/mo │ ├──────────────────────────────────────────────────────────────────────────┤ │ $2,000 ┤ │ │ │ │ │ │ │ │ $1,400 ┤ │ │ │ │ │ │. . │ │ │ │ │ $600 ┤ . .│ │ ├─────────────────────────────────────────────────────────────────│ │ vol │█ █ █ █│ │ └─────────────────────────────────────────────────────────────────│ │ 2025-11 2026-02 2026-05│ └──────────────────────────────────────────────────────────────────────────┘
eBay completed sales. Excludes accessories, parts, and non-working units. Hover points for details.
eBay Listings
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