This was the most basic, and consequently the most inexpensive, of Korg's MS series. It featured a 32-note (F-C) keyboard and semi-modular design, in that you could reroute the signal of some modules via patch cords, but you didn't have to use patch cords to make a basic synthesizer sound. A monophonic synth, the MS-10 had one VCO, one VCF, an LFO with multiple waveforms, an ADSR with hold controls, and knobs to control pitch, portamento time, external signal level, resonance, and pulse width. It also had one wheel, for pitch bend.
[from The A-Z of Analogue Synthesizers, by Peter Forrest, published by Susurreal Publishing, Devon, England, copyright 1994 Peter Forrest]
Add N to X,
David Ball, of Soft Cell,
Electronic Dream Planet,
A Flock of Seagulls,
Brian Kehew and Roger Manning of The Moog Cookbook,
[Let us know if you have any further additions to this list.]