How do I turn the sound on or off?
To mute the sound, hold down the OK button for 3 seconds and 'OFF' will appear on the display. To unmute the sound, hold down the OK button again for 3 seconds and 'ON' will appear on the display. This setting is available only in the Standby state.
From the official Samsung MC12J8035CT Countertop Microwave manual, page 14
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