The audio can't be switched off directly in our interface since we don't modify the stream in any way, but you might consider the following options:
Check if it is possible to disable the sound directly on the camera, sometimes it can be disabled separately for individual streams.
If you can't disable it completely, try switching it to an unsupported audio encoding, for example G.726 (only G.711 and AAC are supported).
When your concern is only muting the sound by default when embedding a stream on your webpage, you can add the following parameter to the embed code: "&mute=1" so that the embed code looks like this: <iframe src="//v.angelcam.com/iframe?v=xx111yy00&mute=1&autoplay=1" frameborder="0" width="654" height="8498" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
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