haha i knew that was coming, and its my own fault for not heading it off..
but no, just a speed dial that allows the forward or reverse of the motor based on which way off center the dial is moved. the farther the move the faster. perhaps a better description is something akin to the steering knob on a radio control car. turn the knob CW car turns right, CCW car turns left. turn the pwm knob CW x axis feed right, turn the pwm knob CCW x axis feeds left. knob center x axis doesn't move.
i am not interested in the complexities or expense of converting and setting up my mill to be a CNC, but i could certainly envision a considerable amount of joy machining a part etch a sketch style .. certainly i am not the only one who has thought of this...
i have thought of using something like a servo tester from the RC world but they cannot carry the volts or amps needed.