Rhythmic 10 Portable Keyboard – Polyphonic Analog Synthesizer 1988 (BELARUS Post-Soviet Bootleg edition) | USSR

This is a Chinese synth, but the interesting fact that is was sold in post-soviet Belarus as a Belarussian synthesizer made in Borisov town. You can see two stickers on the photos with the information about Belarus production. The Belarusian factory bought these synthesizers in China and sold them under its own name without changing anything in their construction (even the original sticker was left). So it is a kind of an item for a collection. 

Fully working condition, check the video. One dynamic does not work. 12v adaptor goes with the synth. 

Main features:

• 49 fullsize keys
• main voice polyphony 8 notes (only 4 with accompaniment, key split or manual bass)
• 2 bult-in speakers (12cm, sounds a bit dull and hollow, stereo)
• 12 OBS preset sounds {saxophone, organ, flute, chimes, guitar, violin, clarinet, music box, oboe, pipe organ, vibraphone, piano}
• 11 OBS preset rhythms {waltz, tango, bossanova, 8 beat, foxtrot, hard rock, 16 beat, shuffle, march, disco, electric pop}
• master volume slider
• separate rhythm volume slide switch (6 steps, responds slow)
• separate volume +/- buttons for chord, bass, main voice, synthesizer (each 16 steps)
• sustain & vibrato button
• simple "synthesizer" (only 20 combinations made from 5 waveform & 4 envelope settings, many identical with preset sounds)
• tempo +/- buttons (57 steps)
• rhythm fill-in button
• 8 LED row for rhythm tempo
• 4 rubber drumpads {base, conga, snare, hihat} (nicely responsive)
• programmable drum pattern ("custom drummer", only 6 or 8 steps)
• accompaniment mode switch {off, keyboard split, manual bass, single finger, fingered}
• 3 chord preset sounds = {piano, organ, guitar}
• 3 bass preset sounds = {violin, oboe, organ} (all with short sustain)
• 3 accompaniment pattern variations
• transpose +/- buttons (-6 to +5 semitone steps)
• stereo panning effect (3 speeds, no "off" setting)
• 4 analogue percussion sounds:

base = dull, short knock conga = dull drum hihat = short and quiet transistor noise hiss snare = popping noise + "hihat" sound

• main voice sound is made from multipulse squarewave timbres muffled through different capacitors and simple digital volume envelopes (with audible zipper noise).