sell it and buy a real piano accordion, also food for thought,

if you were running your power by a gas generator, it will create the hum you're talking about through the PA. Experienced that annoying issue a couple of times, but you don't really hear it unless you're not playing. Another thing to consider is going to a professional sound engineer to learn how to set your PA right. Best thing I ever did. Rule 1 set your gains first, and you never run out of slider.

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