My knowledge of electric things varies from
(a) that bit hurts to
(b) nil
so others will, no doubt, put the technical bits in order.
However, going back a few decades, we routinely recorded flight test work to video using a home made patch cord which had nothing fancier than a variable resistor in the circuit - worked real fine. We played with a few resistance values until we ended up with something that worked OK.
I'm sure it can be done far more elegantly .. the main point is that it can be done cheaper and effectively.