Thanks for this info! It’s just what I need. Just so I’m clear, because this type of modification is a little out of my wheel house, I should only need one resistor that connects the tip to the ring? or do I need two resistors that connect the tip in series to the jack and the ring in series to the jack?
Also, should l disconnect the negative completely from the line going to the DB25 end? Or is adding the resistor enough?
Update: I’ve drawn up how I think I should modify the jack and have attached it to this post. The resistor is added between the tip and ring wiring, and then the ring wiring is cut in its way to the DB25 cable.
Is this right? THANKS AGAIN 🙂