Sound only playing for a couple of seconds


I have added sound to my game as per Lubos’ instructions but the sound files will only play for a couple seconds. This is fine for sounds such as those when an item is picked up as they are less than a second long but I have a couple sounds such as a clock ticking which goes on for longer and this sound is cut off after a couple seconds. Is their a setting how long the sound file should play or something like that or is it another setting I am missing. Thanks