via this auction
This is the one from this video.
"A monophonic synthesizer Estradin - 230 (plant "Elektroizmeritel" of Zhitomir) contains 4 main sources of sound - 3 tone generators and the source of noise. Such external sources as electroguitar and electroorgan can be connected to the instrument. The filter of lower frequencies is intended for changing harmonic compound of signals of audible frequency in self-excitation condition. This filter can be used as fifth source of sound.
There is a possibility to control attack, release and sustain. One use such an interesting effect as sliding transition from one sound to another. There is a memory device in the synthesizer that saves sounding of tone as soon release time.
ESTRADIN-230 is powerful monophonic 3-OSC synthesizer , has 4-octave keyboard (F-C) with velocity (sensitivity assign to vibrato effect). For live performance there is a wheel which provides pitch shift. ESTRADIN 230 is based on 3-VCO (OSC-3 can work as the modulator),
1 VCF (lowpass 24dB/oct) with ADSR, 1 VCA, 3 LFO, noise generator (white/pink), glide, memory. It has an EXTERNAL INPUT allowing to use FILTER and GENERATORS with OTHER INSTRUMENTS such as guitars, synths, etc! ESTRADIN-230 consists of 5 main sections - OSC, MIXER, MODULATION, FILTER and AMP."
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