The original DX-7 did not produce the 0-128 level of velocity, so when triggered by another keyboard, it's sounds tended to sound brighter (actually, a bit too bright).

The Tyros (all models) sends the full 0-128 levels of velocity.

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.