A twin roll caster and a method for operating a machine of this type. The pressure in the surrounding of the container and thus within test cavity is monitored. The hardware component can be operable to track the plurality of taints. Also, feedback signals are processed by a auditory mask estimator. When the driven amount of the vibration type motor is small, the vibration type motor is driven by a high voltage in a frequency range with a high lower limit as compared with a case wherein the driven amount is not small, thereby making it possible to realize high-speed focusing and suppress electric power consumption. While the optical scanning system is operating in the extended feature class programming, the license key is used to unlock at least one of the extended classes of features and functionalities, and program the optical scanning system to operate with at least one of the extended classes of feature and functionalities, in addition to the baseline classes of features and functionalities.