A phase-locked loop includes a phase-to-digital converter portion as well as a novel correction portion. For one or more feedback classes, at least one feedback message may be generated from the one or more process data packets associated with a process that may be associated with the one or more feedback classes. The flexible member pushes the main clip to the sub-clip, so that the sub-clip radially and axially approaches the transmitting member. This adjustment screw has one end defining a pivot piece 7b or a valve drive piece 7Ab. The detected transmitted polarized carrier wave and the inducing field are analyzed to establish the roll angle as the launchable body leaves the launcher. The apparatus may be adapted for use on shoes, a user’s wrists, or the like, for the purpose of encouraging the user to run as fast as possible, and to ensure safety of the user at night.