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In page Yamaha DX7:

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Compared to the "warm" and "fuzzy" sounds of analog synthesizers, the digital DX7 sounds "harsh", "glassy" and "chilly",[1] with a richer, brighter sound.[2] Its preset sounds constitute "struck" and "plucked" sounds with complex transients.[2] Its keyboard spans five octaves,[3] with sixteen-note polyphony, meaning sixteen notes can sound simultaneously. It has 32 algorithms, each a different arrangement of its six sine wave operators.[2] The keyboard expression allows for velocity sensitivity and aftertouch.[3] It was the first synthesizer with a liquid-crystal display, and the first to allow users to name patches.[3]