The rigidity of a movable pulley half is enhanced by the rigidity of a cylinder fixed to a back surface of the movable pulley half and influences of a controlled hydraulic pressure and a centrifugal hydraulic pressure which are exerted in a hydraulic fluid chamber partitioned in the cylinder. The formulations and treatments provide for subtherapeutic levels of the mononitrate in a washout period to prevent nitrate tolerance. The method comprises the steps of storing line selection information; monitoring the input module for initiation of a call to the target recipient; upon detecting the initiation of the call, selecting a line from the at least two lines in the line selection module, the selected line is dependent on said line selection information; and making the call to the target recipient on the selected line.