How to mute the sound of samsung hmx-u20 camcorder?

In my college annual day I am planning to take all pictures and videos with my samsung hmx-u20 camcorder. The annual day will held in college auditorium, so I want to mute the sound of my camcorder. But there is not any option for it. So tell me how to mute the sound of samsung hmx-u20?

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