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Thanks for your responses. With nothing to lose, I may try some more agressive things with the Korg. My next piano will be an accoustic, maybe a good old upright which can be refurbished by a piano tech.

I have a Korg Concert Piano C-15, which is aging. I believe the electronic components are going. Capacitors tend to go first, so I've replaced most of the polarized electolytic sapacitors. It still fails to make sound except a brief "burp" when powered on. I suspect it is the main amplifie...