SoundBank file
From Serious Sam's Bogus Detour
.sbnk
<string name="beam-loop-snd">sounds/payload.sbnk:healgun_loop</string>
<soundbank> <sound category="sfx" name="healgun_loop" volume="1" is3d="true" looping="true"> <source res="sounds/healgun.wav" /> </sound> </soundbank>