Can I edit a 'looping' sound effect?

[LFyfe]

I wanted to edit the 'Frostbite' spell sound effect as it was simply too loud compared to the flame spell.

 

I extracted the .bsa no problem, edited the sound using Sound Booth then placed it in the data folder. The game loaded the new sound correctly, although it doesn't stop playing when I let go of the button, the sound continues until the wav has finished. It's as if the sound file had markers within it to indicate when to stop/loop, and these markers have been lost due to editing with Sound Booth.

 

Is there any way to get around this or is editing these sorts of sounds much more complex than I thought?

 

Thanks