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The Movietone sound system is an optical sound-on-film method of recording sound for motion pictures that guarantees synchronization between sound and picture. It achieves this by recording the sound as a variable-density optical track on the same strip of film that records the pictures. Although sound films today use variable-area tracks any modern motion picture theater (excluding those that have transitioned to digital cinema) can play a Movietone film without modification to the projector.

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