Looping Sound

Is there a specific way to make a sound loop or do i have to make a repeater? (AKA if the sound is long 53 seconds then I need to play the sound again after 53 seconds)

http://developer.valvesoftware.com/wiki/Looping_a_Sound best way to loop a sound, sound forge seems to be best at it, but Wavosaur works pretty good too and its free. You can still loop a sound through lua, but its very hacky.