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reproducers synchronized to the picture, but in the 1950s systems using magnetic stripes on the film itself came into use. Cinemascope used four such tracks (left, center, right and surround), and the subsequent Todd-AO 70 mm system used six (left, left-center, center, right-center and right, plus a single surround channel). Unfortunately, these magnetic systems were not only very expensive but were also unreliable and so were little used, the industry preferring to stay

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