Referee! Can’t we suspend his poetic license…?
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And so we venture once more into the dark and dreary depths down in the desperately dark dungeons of dubious deeds and plumbing. . . .
A new feature of the mucking around with Power supplies might well have raised its head.
Back Powering.
The pedal board has the TP1 mod on a Pi4 ( No polyfuse, I believe. . .) and it has an interesting backpower when the Motor 61 is connected. with Power in completely disconnected the Motro 61 powers the Arduino connected to the Pedal Pi4, and the Pi doesnt start.
Given the motor CAN be be driven from the USB as a un-powered device but you loose the flying faders … 
. . . . .
I’m running it un-powered for the moment.