One screen...cost:$400 plus.:O

One button...Cost: comparatively negligible.

Screen broken..arranger no go. .

Button broken...usually a work around until repaired.

Some people are slow to grasp things... ...

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