GGG to Deadring build
I have built a modded a General Guitar Gadgets PCB to match your deadringer schematic (I bought the PCB years ago before I'd found yoursite),
I used a dp (on/off/on) switch to switch between vintage, comp cut and Mosfet modes and then a single Spdt to connect the flat mids mod (using it a simple on/of with on connecting the resistor to the boost switch leg
There's only two issues with the build, a slight lack of volume the volume knob is almost on full to get unity gain
and there seems to be no difference between having the flat mids mod in or out the circuit is there anything I can do to look identify the problem as other than this it seems to be working absolutely fine