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Thanks again everyone for your help! I just reflowed all the solder joints carefully. The charge pump IC came with the Phase II kit from Musikding, so I assume it should be a reliable one, but I know that’s not always guaranteed. The high-pitched noise is still there, unfortunately.

That was fast! Thanks for the helpful suggestions! I’ve now rerouted the input and output wires underneath the PCB, unfortunately, the high-pitched noise is still there. I'll attach a photo of the charge pump IC so you can take a closer look. Maybe it’s not the right type or a...

Hey folks, I just finished building the lovely Phase II and everything works great functionally — the effect sounds awesome! However, I'm experiencing an issue: there's a high-pitched noise present even when the pedal is bypassed. Here's what I've tried so far: Double-checked all component...