Hi,I bought tu155f about 3mounths ago and got the same questions. These controls look the same as on mine tractor. If I remember right, the rocker switch, in the end of row, controlls tiller inclination sideways ,one of knobs was responsible for giving tilling depth,green knob for quick lifting/lowering given tilling depth.I don't know about knobs under the lid,You ,probably know that better now.You could share your experience.