altair-231 is a monophonic 3-osc power synthesizer produced by cccp estradin rip radioplant located in zhitomir city. synthesizer has 4-oct keyboard (f-c) with velocity sensitivity assign to vibrato effect. sound control is performed with round knobs and switchers. for live performance there is a wheel which provides pitch shift (called glissando). synthesizer is based on 3 vco (any can work as the modulator), 1 vcf (lowpass 24db/oct) with adsr, 1 vca, 3 lfo, noise generator (white/pink), portamento. consist of 5 main sections - modulation, osc's, mixer, filter and amp (called contour). the synthesizer has a label of the soviet "state sign of quality". unit in mint condition!!! tuned to specification. more info here: http://www.geocities.com/rusynth/altair.htm price not incl shipping.