You may choose that, in addition to seeing when a new match arrives, you want to hear an alarm sound when one arrives as well. You can do this by enabling an audible alarm.
Start by viewing your alarms by clicking the Alarms feature in the menu.
Click the option for Audible Alarms to turn them on. Clicking again will disable the alarm sound. With this option enabled, TruckersEdge will audibly alert you each time a new match arrives to any of your alarm searches.