A nonlinear broadcast system with improved entire resource utilization efficiency gives priority to securing hardware resources for broadcast, for preventing broadcast accidents. The first and second sensors are rotatable relative to the annular ring and disposed a predetermined distance from the axis such that the first and second sensors have a first and second output level respectively that is proportional to the angular position of the annular ring. In addition, the interface provides block morphing, free-form text boxes, error navigation, error indication, and block execution status information.