I’m currently building the one piece PCB for version 4 and have a number of through PCB holes left (in areas of U5 & 6 and U8 & U2), am I supposed to connect these through the board to the tracks on the backside ?
I’ve looked through the forums and constructions details but cannot find an answer to this.
If it isn’t mentioned in the build guide, ignore it. FWIW the pads right of U6 are unused DIN inputs, not in the switch matrix. Everything else is either a via (not a pad, vias connect tracks between the layers) or it’s a documented header (which you probably don’t need).