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I am changing a friend's POT in Boss FV-500H volume/expression pedal and was wondering if anyone has a schematic and diagram showing the harness used to change the volume as well as the electronics (which I assume are simple, but there are at least three POTs/vari-resistors)? I can't find anything on the web. I think it will be a little more involved than changing the POT in a ShoBud Volume Pedal and was hoping to do some homework beforehand.