A method and apparatus for restoring to chemical stability motion picture film having an acetate base which is suffering, or which may begin to suffer, from the deterioration generally referred to as \u201cvinegar syndrome. Throttle control mode may idle the superturbocharger during low and medium engine loads, so that boost is not created in the intake manifold. A first bearing and a first brake are located proximate the first end for receiving and frictionally engaging the first mounting post. For each data modulation type, the difference between a minimum signal-to-noise ratio at the connection rate and a minimum SNR at the next higher connection rate is calculated. At least one of the desired rolls to be included in the multi-roll pack is taken apart from the other rolls of the roll set resting on a conveyor and is moved to a waiting station and is then moved back from the waiting station onto the conveyor in a manner allowing the desired rolls of the multi-roll pack to be sorted into a desired order having the adjacent ends of the rolls facing each other. The output signal from the device for determining the transmission quality of the communication system may be applied to the regulating device, which drives the polarization-controlling device to change the polarization of the optical pulses in such a way that the transmission quality is optimized.