Electromusical instrument "Rhythm-1" was produced since the beginning of 1979 by the Kirov software for the production of musical instruments. "Rhythm-1" is a keyboard portable electronic organ, it has a 5 octave keyboard, with the ability to separate sounds in the right and left sections, a built-in rhythm block and auto-accompaniment function with different styles. EMR can produce organ, string, wind, and percussion sounds. Various registers are provided for changing the organ sounds, bass, accompaniment, etc., as well as adjusting the balance between parts of sections and other timbre modes. Among the effects are - frequency vibrato, slip, tremolo, percussion, attenuation. There is a volume pedal. The tool is in a hard case, weight about 30 kg. Functions of the accompaniment section: styles: Waltz, Tango, Swing, Rumba, Samba, Bossanova, Foxtrot, Rhythm-and-blues, rhythm start, bass level, volume, tempo, foot start: keyboard, automat; Accompaniment: tonal, percussion. Section of balance and levels: left manual and bass: 16 ', 8', 4 '2'2 / 3 2' 1 '; balance comp. / left manual, right manual: 16 ', 8', 4 ', 2'2 / 3, 2', 1 '; , balance drums / comp. Percussion section, ext. sounds and effects: bass, solo, alto, gaba, trumpet, violin; 16 ', 8', 4 ', 2'2 / 3, 2', 1 '; on percussion / tremolo, slip, effects: perk / tremolo balance, frequency and depth of vibrato, percussion depth, tremolo frequency, attenuation. Rear panel: pedal input, output, fuse, power plug, network incl.