We know that air molecules are subjected to random motion in different directions. A sound wave is a push toward these molecules to make a wave front to make them expand or contract in groups so that we can hear a voice message in our ears. The question is that what happens when different sources are propagating sound waves at the same time. Every molecule that feels the waves stars moving in a different direction depending on the direction of the source. We have to plus this to the random motion of air molecules as a gas. How this makes a wave that carries the information of multiple sources ? I know all the science about wave addition but from the view point of single molecules moving, it's not that much clear. Can anybody explain this ?