Apparatus and method to monitor the coupling of one or two audio devices and to augment the function of a PTT switch to causes the PTT function of one audio device to be engaged regardless of which of the two operated positions into which the switch is moved in response to there being only the one audio device coupled to the apparatus and in response to the one audio device being a radio, to cause the PTT function of either one of two audio devices to be selected to be engaged depending on which operated position to which the PTT switch is moved in response to there being only one audio device in the form of an intercom system (ICS) coupled to the apparatus with the other audio device in the form of a radio being coupled through the ICS, and to allow the PTT to be used to select the PTT function of either one of two audio devices to be engaged in response to there being two audio devices in the form of radios coupled to the apparatus.