A theremin is unique among musical instruments in that it is performed without being touched by the operator. The musician stands in front of the instrument and moves his or her hands in the proximity of two metal antennas. The distance from one antenna determines frequency (pitch), and the distance from the other controls amplitude (volume). Most frequently, the right hand controls the pitch and the left controls the volume, although some performers reverse this arrangement. Additionally, some theremins use a volume dial and have only one antenna.Via.
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