Intermittent problems are damn annoying...
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It's the loss of confidence in the keyboard performing properly that spoils an otherwise relaxing and fun gig.
Maybe someone on Korg forums will have an answer or a fix.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.