I got that, all i wanted to know was, if a producer has to manually operate them, like with his hands and if so how the fk they reach every knob and slider.
It's easy.
You wouldn't be reaching all over the place rapidly.
Just small adjustments now and then. It's not like a dj who constantly fucking with knobs n shit.
You touch em only minimally. If not you're likely doing something very wrong.