At the time of the change-speed, by correcting the torque reducing portion of an output shaft during the change-speed, the revolution number of an input shaft is controlled on the basis of the corrected torque reduction correcting value. The device comprising first and second terminals which, in use, are connected to components in a system for controlling mechanical forces. A method of making this composition, and of using this composition in a food product, is also described. An actuator is disposed on the base.