A multiple string tuning peg for a stringed musical instrument capable of independently tuning at least two strings. The digital driver according to the present invention is constituted in such a manner that, by successively inputting digital data to a shift register, the digital data are shifted in the shift register, and the resulting output is sent out to latch circuits. The power generation unit supplies electricity to the electricity system, and the control unit controls the power generation unit and the load unit on the basis of values of a plurality of types of electricity handled by the electricity supply system. The points may be identified by identifying points on edges of the polygon having vertices assigned to different bins. The lookup tables output an accumulation adding value derived from multiplying, by impulse responses, the signal voltage value after quadrature modulation and supplies it to the subtractor. To this end, according to the airbag apparatus according to the exemplary embodiment of the present invention, a tether coupled to an airbag pulls a vent cover while being tightened by expansive force of the airbag so as to form a communicating hole, which is in communication with a vent hole, between the airbag and the vent cover, and allow the vent hole to be opened.