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Old school DC relay switch bank. You can see the as yet unwired footswitch jack and the OD master volume on the chassis. There's a couple hundred volts on the green line out to a stout cap, then variable resistor to ground for the AC signal scrub. Return is on the other side of the cap, DC filtered off. We might want to tune that cap size for tone or to mitigate any popping, so it's out there where we can work on it.