The default Real-time page that ships with QueueMetrics will play sounds when yellow or red alarms are triggered.
The sounds played, or whether to play any, are controlled by a couple of system properties in the configuration.properties file:
sound.yellowAlarm=http://myserver/audioYellow.wav
sound.redAlarm=http://myserver/audioRed.wav
If you want to turn them off completely, just set them to blank.