I had an NP30 on my sample account when Squeak e-mailed me about the noise he heard in his piano.

Try as I might, I could hear no noise whatsoever in the unit I had, and my hearing is very good.

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