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Electromusical instrument "Ekvodin V-9" was produced in the autumn of 1958. It is the first domestic monophonic multi-timbral electromusic instrument intended for use in various instrumental ensembles. In the EMP circuit, 32 radio tubes were used. Rated output power 10 watts. EMR made it possible to create up to 330 different timbre combinations. The instrument had such unique effects for its time as controlling the sound with the help of the impact force on the keys, finger vibrato on the keyboard (aftertouch) and automatic vibrato. Busting timbres was carried out using the keyboard switch. In addition to the usual keyboard, the EMP had a neck with a sliding contact that allowed the pitch to be changed smoothly. The B-9 instrument was also equipped with two foot pedals (for controlling the volume of the sound and the character of the tone) and knee levers controlling the attack and attenuation of the sound.