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I recently bought a second hand CDP-230R and found something does not sound right: There is a rare aka-bell sound that sounds only on three keys in piano tones. The problem indeed occurs with several tones, actually it happens almost in all Piano-related tones. I did an extensive research and found something really weird: The issue is not consistent, it means the rare bell sounds changes between close-by keys when the tone changes but without a pattern. Let me explain with some examples: With tone 001, The rare bell sounds occur in Ab, A and Bb (as I mentioned before, close to the middle C) With tone 006, The rare bell sounds occur in G, Ab and A With tone 007, The rare bell sounds occur in B, Bb and C If I use the transpose function, the bell sound moves up and down, but if I use the pitch bend weel it does not move. I already restored to factory settings but the same. I contacted Casio Support and told me: "This is a natural part of the sound, originating from the piano that was sampled to create the sound. Therefore, it would be reproduced the same way on all CDP-230R units.".."What you are hearing are some subtle harmonic overtones, which were present in the original piano that was sampled to create the tones. They are a normal part of the sample, so there is no need for concern." The question for the forum are: Have you ear the same issue in your CDP-230R? The issue in my piano is affecting my performance because the sub-harmonics make a big distortion playing alone. Is there a way to re-map piano sounds? I upload a recorded video sample to illustrate this issue. Thanks a lot 001 Ab-A-Bb.mp4