crwdns2933423:0crwdne2933423:0
crwdns2918538:0crwdne2918538:0

crwdns2934241:0crwdne2934241:0 jaordyna

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On my Casio Privia there is a function labeled "touch response" (functions are labeled above keys, this particular one is the furthest right function labeled on my keyboard; other models may differ, see your user manual). Press and hold "function" while pressing the affected key (middle C in your case) and choose the "0" under touch response. This fixed it for me.

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open