Gary, I'm sure that not everyone has had great luck with the harmonizer/microphone system in the Yamaha arrangers, but Dan Rymut has a super tutorial on PSR Tutorial that really clears up a lot of the common problems that were experienced by users.

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