At Vintage Radio (a community broadcast station run by unpaid volunteers) in the UK we have been using the Silence Detector for 18m to email us when our internet feed goes down. We are just about to start broadcasting on a VHF FM frequency from the 5th November 2011 for a month under a special UK restricted service licence and have set the silence detector up via some relays controlled via the detection software and the serial port so that it will switch the transmitter audio feed to a backup audio file that is played by the Silence Detector built in player. This all works very well but when the Silence Detector software reverts back to playing the normal audio feed we have found that the player in Silence Detector continues playing, even though not feeding the transmitter, rather than stopping ready for the next desk feed outage. So, my question is, how do I stop the built in mp3 player playing the backup audio file when the silence detector detects a valid audio feed again? There seems to be no mechanism to do so or are we missing something very obvious?