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  vertical stylus motion
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  wax cylinders
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  mechanical digital, automated instrumentals
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  horizontal stylus
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  amiplified voal recordings
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  refined speeds
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  vinyl belt
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  pressing grooves into vinyl cords
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  plastic belt that rotated on a cylinder
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  horizontal stylus
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  magnetic wire on wheel
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  a tape that was played in a cassette
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  designed for radio broadcasters
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  endless loop carttige
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  linear pcm