1. A system comprising a controlled apparatus and control device for controlling said controlled apparatus; i) said controlled apparatus comprising: at least one variable operation device; operating means for operating said at least one variable operation device; and detector means for detecting an operation of said at least one variable operation device and for generating a state signal corresponding to said operation; (ii) said control device comprising: first means for storing at least one pre-set operation pattern for said at least one variable operation device and for generating a pre-set command signal for a point value of the operation of said at least one variable operation device, said first means also being arranged for generating a pre-set state signal; second means for generating a modification signal for modifying said pre-set command signal, thereby to generate a command signal for controlling said operation means so as to vary said point value of the operation, said second means being a feedback means for detecting a difference between said pre-set state signal and said state signal, thereby to generate said modification signal as a feedback signal; and analysis means for: (a) determining a relationship between said command signal and said state signal, and (b) generating a compensation signal on the basis of said relationship, wherein said control device is arranged further to modify said pre-set command signal on the basis of said compensation signal, and to control said operating means thereby.