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They etch the sound waves on the discs with the frequencies and amplitudes. For example the gramophone disc. Its huge and has a lot of circular discs spiraling towards the center. Originally the person sings in the mic and the waves move the carving tool in the similar pattern it itself is moving and makes grooves and cuts on the discs - deeper cuts for higher amplitude regions while shallower in the less amplitude regions.

So when you play it the pin passes though these grooves and relays the information through its body into the loudspeaker which amplifies the sound enough for us to hear it.

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