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On the bottom row are a series of buttons. From the manual: Signal (Option) Press the Signal (Option) button repeatedly to change the volume or turn on/off the button tones and the end of cycle melody.
Sorry, there was a problem. Please try again later.Press the Signal (Option) button on the control panel repeatedly to change the volume or turn on/off the button tones and the end of cycle melody. ^Daphane
Sorry, there was a problem. Please try again later.

