Regulator for precision control of pressure based on a means of measuring pressure differentials. The exit slide has an inclined portion along which the rider decelerates from the entrance as he or she moves upward, followed by downward travel along a predetermined path of the separate exit slide from a high elevation, past the entrance, to a low elevation. When the drive levers are returned to their operating modes and the ignition is turned on, the control switches are closed, energizing the control circuit to pressurize the air cylinders and release the brakes against the bias of the tension springs. The language compiler or interpreter can read the API information at compile time andor runtime.