Applescript howto set the master mute volume?

Hello i´m trying do do some scripting of Wirecast in Applescript. In a Applescript example from Wirecast i can turn of the “output through your computers headphones”. 

See this example:
on run
         tell application "Wirecast"
                   set my_doc to last document
                   set audio muted to speaker of my_doc to 1
         end tell
end run

What if i would control other parts of the program like for example master mute (volume) where could I find the setting for that? See picture below.


In Applescript dictionary for Wirecast program i can´t find much. Is it even possible or is scripting very limited?

The reason i want to set this is that we have some problem that sometimes this value is set to -30 and I would like everytime that I start the program that I set a value for that

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