Disclosed is a system and method for controlling a virtual engine sound of a hybrid vehicle or an electric vehicle. In the illustrative embodiment, the system uses a pair of graspers which each repeatedly grasp, raise, and drop a test mass. It is configured so that the data for zm blocks is written in parallel on m storing mediums, and then the data for qp\u2212zm blocks is written on w+1 storing mediums. When environmental illumination disappears, the LED epitaxial layer is powered by the external secondary battery to emit light. A series resonance circuit in which an inductor and a capacitor are connected in series to each other is connected between a first port of a central conductor and the ground, capacitors are connected between the ground and a second and a third ports of other central conductors and the ground, and a terminating resistor is connected to the third port. The rear connector is attached to the waist strap, and is attachable to retention hardware.