Connex 3020 Module mute function (v4)

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Hi there- i purchased this module - its pretty good. The weblink for info on it is here: http://www.connexelectronic.com/documents/TA3020v4.pdf

The only thing i am not sure about is how the mute function works - can someone plse explain this to me? There is some jargon in the info sheet about "appling a high logic signal to the pins etc" but this makes no sense to me. There are 2 wires, does toggling these activitate the mute function?

Getting hold of Christi to clarify this issue hasnt been sucessful. Many thanks, simon
 
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