I’m guessing the same power supply is used for all units, but if not, I’m specifically interested in the mod duo and the dwarf. Obviously the power supplies themselves are grounded (having a 3 conductor wall plug), but what about the 2 conductor cable going to the mod? Are one of those conductors at ground?
My reason for asking is I’m building an expression pedal powered by the mod’s usb that uses capacitive sensing. Capacitive sensing is much more stable when the microcontroller is grounded.
From what I observe, the mod doesn’t get a ground connection through the power supply, but through the signal input. So if my guitar is properly grounded (which it is as long as I’m touching the strings), it works. This expression pedal works really well, so I might make a video showing it off and explaining how to build one if there is interest
For anyone interested, i put the code and a schematic for my diy expression pedal using capacitive sensing on github. It’s a super easy project, suitable for beginners
To answer directly to your question (just noticed that you were left with no clear answer…sorry for that), as you said well, the 3 pin PSU are grounded. The 2 conductor cables going to the MOD are not.
That’s fine After I saw your schematic and it’s so lovely I just had a doubt if it works with any foot or it needs to be that type specifically (just kidding here )
please share it
I just had a doubt if it works with any foot or it needs to be that type specifically (just kidding here 
)