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No, nothing. I disconnected everything except for the power cable and I've also tested while not having any of those devices around.

Hello Mitzie, thank you for your response. I've tried it but it's all the same. One thing I've realized is that it gets much more noticeable when I have effects active on a preset. For example, I put a small reverb and a slow rotary effect into a grand piano preset and this causes the noise to be ...

So I got an Ek-50 less than a week ago and noticed a static noise coming from the built-in effects. I know it's not the speakers since I've used them to listen to external audio through aux chord, plus I used headphones and confirmed the noise persists while using them. That's why I think it's ...