I just posted my much more humble pedalboard build (just slapped some pine together with velcro on top). I naively bought a daisy chain power supply instead of something with isolated outputs, and the noise was driving me crazy. Finally today I isolated it to the digitech trio. It came with it's own power brick so running it separately with everything else on the daisy chain cut the noise to nothing. The Xtomp mini is also digital but it's completely silent.
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