There is a sound system already in use in places such as Disney's Epcot centre in florida which use directional sound, but this company audio spotlight. It works by using ultra sound as the waves are smaller and easier to direct into one area. Who ever stands in the beam can hear, those standing outside the beam cannot hear anything, meaning various soundtracks or audio clips can be played in one area, but they will not conflict, also there can be silence outside of the beam area.
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