Motion Control is a compression dampner that is basically a big plastic spring. With the blue dial untensioned the valve is fully open, tensioned it is closed and the pedal platform is engaged. The plastic spring the outside of the unit gets compressed with big hits and valve is bypassed the gate or threshold adjuster sets how easily this bypass ocurs. Where the blue dail sits in it’s rotation does effect the compression (it sets how much the valve is open) but only one of the poploc units allow’s you to set this at a given place. There is a whole range of new mo-co’s coming out with new tricks.