Keyboard: 61 keys (Lower 19 for Accompaniment Upper 42 for Melody) 1983 would put it in time with the Poly-800. Also, a more traditional chord recognition system was included."Ĭurious what sound engine it had on board.
This was the world’s first auto-accompaniment function of this kind added to a keyboard. A built-in computer analyzed the melody played on the keyboard, and generated a complex accompaniment. Via Wikipedia: "1983 - Korg SAS-20: The SAS-20 was Korg’s first arranger keyboard. Includes Compu Music Accompaniment & Rhthm & Auto Accompaniment sections.
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Plus discrete electronics, a very early form of programmer, great-sounding 2- and 4-pole switchable filter, and a handful of unique features, all with circuitry that comes straight from the classic Oberheim SEM modules, make this monophonic analog synthesizer worthy of the Oberheim name." It's a monophonic programmable analog synthesizer with two oscillators, each switchable between sawtooth and pulse waveforms, and each with an independent sub-oscillator. The OB-1 is a cool piece of synthesizer history. This Old Synth straightened it all out (figuratively and literally) and now she plays like new.
I found this OB-1 at a shop in Portland, OR, and it had a number of issues. This video is just running through some of the features, including cross-modulation, presets, 12/24 dB/oct filter, modulation sources, sub-oscillators, pulse width modulation, and a few other things. "My Oberheim OB-1 was recently serviced by This Old Synth in San Jose, CA.
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