AUDIO CONTROLS Crystal_Method : Weapons of Mass Distortion
Sonic and ultrasonic weapons (USW) are weapons of various types that use sound to injure, incapacitate, or kill an opponent. Some sonic weapons are currently in limited use or in research and development by military and police forces. Others exist only in the realm of science fiction. Some of these weapons have been described as sonic bullets, sonic grenades, sonic mines, or sonic cannons. Some make a focused beam of sound or ultrasound; some make an area field of sound. Although many real sonic and ultrasonic weapons are described as "non-lethal", they can still kill under certain conditions.
Sonic weapons used on civilians
Sonic weapons present at the Denver DNC
http://www.liveleak.com/view?i=d66_1196255514
Air Force Chief: Test Weapons on Testy U.S. Mobs
http://www.prisonplanet.com/new-taser-weapons-produced-for-crowd-control.html