Our brains perceive what we hear trailing what we see by small amounts to be completely normal. If you show people a video of an orchestra concert with the soun

Our brains perceive what we hear trailing what we see by small amounts to be completely normal. If you show people a video of an orchestra concert with the sound of a violin coming 50ms before seeing the bow move, most would immediately notice something is off. Musicians performing together, however, is a much harder problem than just listening. Ask anyone who has ever performed in a DCI-style drum corps, they will tell you compensating for hearing someone on the other side of field 200ms or so late is incredibly difficult.