Lathe control, can it be done?

@JohnRob remember these pots don't connect directly to the motor, they connect to various circuits which send the voltage to the motor. Everyone is stuck on trying to figure out how everything is connected versus my original question. I can post the entire schematic if you all would like, but these pots do not connect to the motor directly. They connect to the various circuits which alter the voltage and current sent to the motor.

fieldControl
referenceVoltage

This is part of the schematics where the pots are wired in. P3A and P3B are the pots for the dual head potentiometer.