Hi Tom,
Is it possible for you to provide a sketch of the circuit, so we can be sure to understand what you've done and get it right when we hook it up on the board?
If not, then perhaps a little more detail on the connections to the pot, RX and TX voltages, 4.7k voltage control resistors, and 510k bleeder resistor?
I think this would be a fantastic addition to the uBitx operation - thank you for posting!
