An instance of ClipCore handles the core part of a clip. The functionality to react on a pulse-signal from the timer is implemented in two classes: ClipEnvelope and ClipCore. ClipEnvelope is responsible for the "loop-part" (keeping track of the number of cycles, handling the direction of the clip etc.). ClipCore takes care of the inner part (interpolating the values, triggering the action-functions, ...) Both classes have an abstract public definition and can only be created using the factory method create(). The intend is to provide a general implementation plus eventually some fast-track implementations for common use cases.