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My Mini will tune both oscilators perfectly, but if I tune C1, C4 will be significantly flat (almost sounding like a B). The original MS20 had external trim pots to adjust this: http://www.synfo.nl/servicemanuals/Korg/MS-20_SERVICE_MANUAL.pdf But the mini does not. I've been told that there should ...

My Mini will tune both oscilators perfectly, but if I tune C1, C4 will be significantly flat (almost sounding like a B). The original MS20 had external trim pots to adjust this: http://www.synfo.nl/servicemanuals/Korg/MS-20_SERVICE_MANUAL.pdf But the mini does not. I've been told that there should ...