For dynamically adjusting a color code corresponding to a task performed by an inputoutput port, a retasking request for the IO port is received. The invention achieves a considerable reduction of the environmental load, an improved utilization of reactants, an improved yield, and a cost reduction, and enables production of low viscosity MQ resins. Typically, at least about 99%, by mole, of the hydrocarbon feed is a gas. The time constant of the output voltage control circuit is longer than the time constant of the output voltage detecting circuit. The index cards have cut off inner corners to allow easy insertion and removal.