User blog comment:Firebomb211/SOUND MANIPULATION/@comment-5265497-20130709083056

"The user can create and modify sound waves to mimic, intensify, hush, and distort, as well warp, strengthen, echo, speed up, and slow down sound, using it as powerful physical force and high-speed movement."

So, to answer your question, some users can create sounds and they can strengthen or hush it at any time so depending on the user, it wouldn't matter.

LimitationsEdit
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 * Sound requires a medium to travel through, so a Vacuum can stop it.
 * Sound Nullification

The benefits to being a sound manipulator are numerous. You can manipulate your voice, enhance your hearing, perceive soundwaves and sense through echolocation, attack with burst of destructive sound waves, induce vertigo, absorb sound, emit vibrations via soundwave, mimic soundwaves, be a one-man DJ, compose music according to what you actually think, etc.