Korg MS-10

Korg MS-10 is an analogue synthesizer created by Korg in 1978.[2] Unlike its bigger brother, the Korg MS-20, the MS-10 only has one VCO, one VCF and one envelope generator. It is monophonic and has 32 keys.

This article is about the musical instrument. For the aborted 2018 spaceflight, see Soyuz MS-10. For other topics, see MS-10 (disambiguation).
MS-10
Korg MS-10
ManufacturerKorg
Dates1978–1981[1]
PriceUS$450
Technical specifications
PolyphonyMonophonic
TimbralityMonotimbral
Oscillator1 VCO per voice Triangle, Sawtooth, Pulse width, White noise
Synthesis typeAnalog subtractive
Filter1 low-pass
Aftertouch expressionno
Velocity expressionno
Storage memorynone
Effectsnone
Input/output
Keyboard32 keys
External controlCV/Gate

The MS-10 is well known for its huge sounding electro bass sounds.[3]

Architecture

Oscillator

The MS-10 has one VCO with 4 waveforms: triangle, sawtooth, pulse, and white noise.

Filter

The MS-10 has the same "KORG35" 12 dB/Oct low pass filter as the original MS-20.[4][5] Resonance ("peak" in Korg parlance) is adjustable but not voltage-controlled.

Originally, the filters used Korg's proprietary KORG-35 thick film IC. Later, the filters were redesigned to use off-the-shelf LM13600 OTAs.

A useful illustration of the Korg-35 filter in-circuit is shown here [6] and some photographs illustrating the later LM13600 filter daughterboard are shown here.[7] The tonal difference between the two is that the original Korg-35 filter has a slight amount of hiss which overdrives into the sound at high resonant settings. This causes the filter to have more of a "screaming" effect similar to it being used with a distortion pedal. The revised filter has most of this noise cleared up and is less aggressive sounding.

Output

There is a simple single transistor VCA. The amplitude of the VCA can be controlled by the envelope generator.

Modulation generator

The MS-10 has one LFO, labelled "modulation generator". It has two controls (rate and shape) and two outputs (pulse and sloped).

The shape control affects the pulse width and the shape of the sloped output. At midway, the pulse width is 50% and the output is a triangle wave. Both outputs are available through the patch panel and can be used for triggering the envelope generators – the pulse wave with a key held down, and the sloped without. The depth of LFO modulation of the VCO frequency and the filter cut-off can be controlled from knobs in the respective sections of the control panel.

Envelope

There is one envelope generator with controls for Hold, Attack, Decay, Sustain and Release.

Patching

Although the MS-10 has normalized connections, they can be modified with patch cables. This allows the LFO to modulate the pulse width (which is called pulse width modulation, or PWM) of the VCO or the amplitude of the VCA. It also has a noise generator with white and pink noise outputs, CV in and out, and an external signal input (not to be confused with the "External Signal Processor" of the MS-20).

Compatibility With Other Synths and Modules

The MS-10's VCO uses linear voltage control (Hz/Volt) but note that V/oct scaling (−5V to +5V) is available via judicious use of the "freq" CV input socket. A CV converter can also be used.

Notable users

References
  1. "Top Ten Most Underrated Synths - Page 2 of 11 - Attack Magazine". Attack Magazine. 2012-09-19. Retrieved 2018-08-10.
  2. http://www.vintagesynth.com/korg/ms10.php
  3. "Top Ten Most Underrated Synths - Page 2 of 11 - Attack Magazine". Attack Magazine. 2012-09-19. Retrieved 2018-08-10.
  4. http://www.timstinchcombe.co.uk/synth/MS20_study.pdf
  5. "A-106". Doepfer.de. 2010-06-18. Retrieved 2013-10-07.
  6. https://web.archive.org/web/20150619232549/http://www.punkdisco.co.uk/misc/gear/Korg/MS20/Disassemble1.jpg
  7. "KORG MS-20 "VERSION 2"". Nwheaton.homemail.com.au. 2006-05-11. Retrieved 2013-10-07.
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