/** Stops media application */
 public boolean stopMedia() {
   printLog("halting java audio..", LogLevel.HIGH);
   if (sender != null) {
     sender.halt();
     sender = null;
     printLog("sender halted", LogLevel.LOW);
   }
   if (receiver != null) {
     receiver.halt();
     receiver = null;
     printLog("receiver halted", LogLevel.LOW);
   }
   if (socket != null) socket.close();
   return true;
 }