YAMAHA SK20 SN 4206

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"Yamaha's SK-series are combo-keyboards with synthesizer, organ, brass and string sections. The SK-10 was the first of the SK-series, released in 1979 - the SK-20, 30 and 50D followed in 1980, and the SK-15 in 1981, possibly as a replacement for the SK-10. The SK-10 is the only one in the series that does not incorporate a synth section, but has organ, brass and string sections that can all be played together for more interesting combinations. Very sturdy casing, 4-octave and fully polyphonic the features also include a leslie simulator, vibrato, attack and sustain rocker switches, a slider for 'brilliance' and a one-octave transpose switch. Not exactly feature-laden, but a lovely string synth sound. Interestingly, they are often referred to as 'analog', but in fact do have a digital section. Its organ has one of the early implementations of Yamaha's FM technology in a very limited form, concurrent with the GS-1/2 development platforms which eventually led to the DX series.

The ORGAN SECTION is available in all the SK series synthesizers. It offers a full range of stop levers from 1' to 16', percussion levers with adjustable decay, and controls for overall sustain, brilliance and decay. This gives you quite a lot to work with in the way of synthesis. The organ's sound is FM based and it sounds very B3 like. You can add a Vibrato and a noisy but good Tremolo to it. Its sound is all about the 70's era rock organ, especially with the Ensemble chorus effect in use. It also has a Leslie-speaker output around back.

The PRESET STRINGS section isn't very sophisticated and offers very limited editing capabilities. It is the string section though, that is worth aquiring this keyboard for. Very similar to the best of the string synths, (such as the Arp Solina/Omni or the Logan String Machine) it has a sound reminiscent of the opening of 'Oxygene' (J-M Jarre) or the lead line from 'Love Will Tear Us Apart' (Joy Division).

The SK20 adds the POLY-SYNTH SECTION: a 7-note polyphonic synthesizer with basic filter, pitch, envelope, and portamento controls. It features two (detuneable) oscillators per voice so it's good for thick pads. It lacks any bite whatsoever and, even in normal attack mode, has way too slow an envelope to be used for any bass or percussion sounds. But, the pads and strings you can get certainly shine and glitter like Bowie a-la Ziggy Stardust (especially when layered with the Strings section). It's like a good entry-level synthesizer. Basic and simple LFO, filters and ADSR envelopes. It has a built-in sustain and the Tremolo and Ensemble chorus effect also apply to this section."