I played a private party last night; I was statioined outside. Ran extension cord from outside wall outlet. My psr2000 has never done this. I can't recall if it was just when playing a midi or just when playing a style or both... but I would be playing a song with, say, right hand being piano... and the right hand voice would suddenly change to flute or sax or whatever. Might do that more than once during the song. It also would sometimes start playing the Layer voice. This is with me not striking anything but the keys. Any idea?

I thought it might be 'dirty power' or something power-related. Only because I have seen info about this being a possible culprit for weird things with your keyboard?

I turned it off and back on but that did not fix it. After awhile, maybe 30 minutes of songs, it began acting normally.

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Bill
Yamaha PSR2000