The electro-musical keyboard instrument "Electronics EM-141" (Venta) was produced in the late 80s of the 20th century. This is a single-channel, five-octave, polyphony, portable tool. Designed to perform pop and classical works as a solo or accompanying instrument in professional and amateur ensembles, as well as at home. The instrument consists of the following sections: flute section, percussion section, synthesizer section, chorus-flanger effect section. The flute and percussion sections of the instrument are the generally accepted structure of the organ. Synthesis of sound timbre is carried out from 10 harmonics by dialing their levels. The timbre built on a pure sinusoidal signal makes it possible to imitate the sound of the Hamond organ, vibraphone and other instruments. The synthesizer section, which contains the devices of the controlled filter in the controlled envelope, imitates wind instruments (French horn, English horn, and others), as well as a wide variety of sounds characteristic of synthesizers. The chorus-flanger section enriches the instrument, imparts spatiality to the sound of the instrument and simulates the effect of a sound source rotation in space. The case of KEMI is a part of the protective casing of the device. The instrument provides: high frequency stability of the master oscillator, due to the use of a quartz auto-tuning frequency, the minimum error of the sound scale relative to a uniformly-tempered musical scale, the ability to shift the entire instrument's tuning by / - 1/4 tone, rich timbre of the sound with the ability to control the sound decay. Technical characteristics: Number of manual registers: flute with voice set 10 (16; 5 1/3; 8; 4; 2 2/3; 2; 1 3/5; 1 1/3; 1; 1 1/2), flute fixed inclusion 1, percussion with a set of level 7 (4; 2 2/3; 2; 1 3/5; 1 1/3; 1; 1 1 / 2_), bass registers of fixed inclusion in the amount of 2 lower octaves 2. Full sound range 8 octaves.The error of the intervals of the scale relative to a uniformly-tempered scale, not more than 0.05%. Relative frequency instability of the master oscillator in automatic mode for 30 days, not more than 0.1%. Relative frequency instability of the master oscillator in manual mode for 4 days, not more than 0.3%. Nominal output voltage at a load of 10 kΩ, not less than 0.25 V. Amplitude value, not more than 2.4 V. Signal ratio / (background noise), not less than 60 dB. Dynamic range of volume control with a pedal, not less than 40 dB. Vibrato frequency, adjustable from 5 (-2) to 7 (3) Hz. Weight, not more than 20 kg. Dimensions (in working condition): length 938 mm, width 410 mm, height 125 mm.