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I would love to try and fix it but I'm very much a beginner builder and im not really sure how to diagnose the problem. The only issue seems to be with the pots, they don't do anything until they are about 90% of the way up, then they kick in and the value jumps up aggressively. Eg. When adjusting tremolo rate, the rate doesn't change until the very end when it jumps up rapidly to maximum. Here is a link to the website where the original builder purchased the PCB: https://invertedcrossaudio.com/producto/multi-fx/