A system and method for generating game sounds in a directionally adjustable manner which includes a friction pan call having a plurality of holes on generally opposing sides of a sound chamber wall, and a method whereby holes are successively closed in an incremental rotating manner around the call so as to help to create a sound emulating a moving sound source. The image forming apparatus has an operation panel which, in a first mode in which an image forming process and an erasing process are not executable, accepts selection of any mode of a second mode in which the image forming process and the erasing process are executable, and a third mode in which the image forming process not executable and the erasing process is executable. Plate-shaped main electrodes on at least one face of each of which silicon oxide film is formed are made to be in contact with the sides so as to close the openings, with the silicon oxide film being placed so as to face the inside of the container. Responsive to the control information demodulated, bitstream information is obtained to configure the portion of the PHY block using the programmable logic of the programmable device.