Would I Buy A Tyros 4 with 76 keys?.......

Nope.

However, if the keys were weighted hammer action, like on the p-85 or DGX, I would consider it, but not as a gigging arranger, but more of a studio piece.

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