Let's see...at least in the higher end, probably the mini key MK-100 (1983) or the PS-6100 (1984)...but I'm only guessing off the top of my head.
More importantly...what manufacturer will be the first to return to black?
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.