| 摘要 |
PROBLEM TO BE SOLVED: To recognize an electronic volume set at present at a glance without providing any display for displaying an electronic volume to be set in the surrounding of a single electronic volume adjuster. SOLUTION: A CPU 11 detects the rotating direction of a rotary encoder 10 and a non-lock switch (a, b or the like) which is turned on. The CPU 11 recognizes an electronic volume (Va, Vb or the like) corresponding to the non- lock switch which is turned on as an object to be adjusted by the rotary encoder 10, and turns on/off a light emitting diode (LED-a, LED-b or the like) which indicates the electronic volume corresponding to the non-lock switch which is turned on. Moreover, the CPU 11 turns on the light emitting diode which indicates the electronic volume which is set last time.
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