You can turn the operation beep on or off.
PLAY/STOP・ENTER.

or
+ to select “ON” or “OFF,” and then press
PLAY/STOP・ENTER.
(stop) to exit the menu mode. You can select one of the menu items available.
ON:
A beep will sound to indicate that an operation has been accepted or an error has occurred.
(Initial setting)
OFF:
No beep sound will be heard.