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In page Yamaha DX7:

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Yamaha displayed a prototype of the DX7 in 1982, branded the CSDX, in reference to the Yamaha CS range of analogue synthesizers.[5] In late 1982, Briton Dave Bristow and American Gary Leuenberger, experts on the Yamaha CS-80 synthesizer, were flown to Japan to develop the DX7's voices. They had less than four days to create the DX7's 128 preset patches.[6]