I know several professionals happily using the S900/3k/Tyros vocalizer...it works well for them, although it did require some adjustments.

And, they love the convenience of having everything in one unit.

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