I use them quite often in recording, but less often "live". They are useful in multi-tracking.
I like using them as a basis for Vocoding as well....the Tyros4's Vocal Harmonizer (VH2) is pretty trick at vocoding.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.