Controls setting of Powerline 1 microphone                    
Func AX 35h
Param DX 1 to turn microphone on
0 to turn microphone off
Return AX -1 if Powerline 1 board not installed
0 otherwise
Delay None
        Controls the setting of the Powerline 1 microphone.  The
        parameter to this command selects the microphone state.  A
        parameter of 1 sets the microphone on, disconnecting the record
        channel from the local telephone and the line and connecting it
        to the microphone.  A parameter of 0 set the microphone off,
        reconnecting the record channel to the line or local phone,
        whichever is active.


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