| 摘要 |
PROBLEM TO BE SOLVED: To provide a game machine facilitating the operation for setting sound volume, and easily setting the number of grades for setting sound volume. SOLUTION: A control circuit 21 outputs a sound control signal to a sound driving circuit 25. The control circuit 21 compares a set signal, which is output from a volume 24, according to the operating position of an operation part with a plurality of reference values, and outputs a determination signal according to the comparison result to the sound driving circuit 25. The sound driving circuit 25 outputs a sound driving signal having a level according to the determination signal corresponding to the sound control signal. When a reference value adjusting condition is established, the control circuit 21 adjusts the reference value based on the set signal output from the volume 24. COPYRIGHT: (C)2010,JPO&INPIT
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