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sound effects[′sau̇nd i‚feks]
noises and sounds arranged in some definite tempo and rhythm and used in the production of theatrical performances, motion pictures, and radio and television programs.
Sound effects are achieved with special equipment. When combined with other means of expression, such as music, scenery, and lighting, sound effects help to reveal the content of a production and to create the necessary mood, tempo, and rhythm of a performance or a motion picture. Sound effects can be especially important in radio, where sound in all its diversity is the principal means of expression. Sound effects may be realistic, fantastic, arbitrary and abstract or comically absurd, depending on the style and treatment of the performance.