MATRIXSYNTH: Korg Sigma Mono Synth with MIDI Retrofit


Saturday, August 18, 2012

Korg Sigma Mono Synth with MIDI Retrofit

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via this auction

"It has 2VCO's and 3 sections, SYNTHE / INSTRUMENT / EFFECTS (all mixable). Its also got the following although not implemented as standard synths. Random and noise generation, PWM, vibrato, ring modulation, some VCF, LPF, HPF control etc etc etc. Put it this way you'll never run out of possibilities. The bad new is, as with most synths of this era it's got its faults but these are minor. Anyhow here's a list of known problems:

1. One of the keys has been cracked (pic3) but doesn't detract from playing.

2. Both joystick stalks have been broken (a common fault) but replaced years back (pic2) with bespoke plastic ones. These still work and look great.

3. Pots on the performance section (pic2) need either cleaned ot replaced, Yes they crackle when turned but that's easily sorted perhaps with a bit of contact cleaner. Switches are a bit hard to move, probably worn out with over 30 years of use. This has to be expected though so please keep that in mind.

However, there's lots of good news. It's cosmetically in very very good condition, fully intact with some minor small scratches and still has its pull out music rest . I played it before advertising and it sounds fine. But best of all it has a MIDI retrofit installed (many years ago). This has pretty basic midi implimentation whereby you press a little button on the fascia and the channels go through 1-16. I have no way of testing it but know it worked because I used it in midi setup (many moons ago). It also has midi independent tuning, again by a little pot just under the fascia (access hole). You can see them on pic2 just below the gold legend. There's no midi sysex here mind you, just note on/off data accepted. It also has your usual Hz / Volts connectors so midi converters could be used although I've never tried.

Anyone familiar with these machines will know how good they are. Users include Rick Wakeman, Keith Emerson and Jean Michael Jarre, all great musicians of the time but you can still see these machines in action on youtube. I've owned it for a considerable amount of time (with a Korg Lambda ES-50) but with the passage of time means I'm never gonna use it again. Since there are plenty of musicians & collectors out there who would and the inclusion of a midi retrofit must make it extremely rare and desirable.

http://www.youtube.com/watch?v=2iGltNKt1_4&feature=related"



YouTube Uploaded by ikworgek on Dec 28, 2008

"Korg Sigma with a Kenton pro-solo.
Weird old Korg synth with nice filter (same as MS20) and ringmodulation"

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