via this auction
You can find a demo of one here.

SEIKO's system was built around a 16 harmonic additive synthesis engine. The user can set any of 16 levels for creating the waveforms / sounds that could be played on the keyboard. The synth also features two envelopes and and LFO for shaping and modulation of the sounds.
Basic sounds (namely PIANO ORGAN HARPSICHORD FLUTE STRINGS ELECTRIC PIANO JAZZ ORGAN VIBRAPHONE CLARINET BRASS) are crystal-clear. They can be edited using the LPF filter, Envelope Selectors 1-4, 4 sounds that can be saved and two chorus effects. The delay (off, short or long) and sustain attack and release can be set using the ‘Time” sliders which happen to be very precise (values include 0, 0.01, 0.02 , 1, 2, 3, 5 or 10 seconds). Every parameter can be set using the LCD screen, the 4 envelopes available can be visualized as well as the spectrum settings (over 16 harmonics)."
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