Ok, I have my Zynaptik board now… I am not likely to hook up the midi ports externally, but I just had a thought… I could try and use them internally as an input … am i right in thinking i can wire from an ESP32/ESP82866/Arduino directly as follows? :-
5V - via a 220 ohm resistor
signal - via a 220 ohm resistor
like this …
but without the socket?