And to amplify that, the amplification has to be done in a way that matches the time domain or the sound arrival from the acoustic source. the reinforced source has to follow. from our point of view, we need to know within about a ten millisecond error where each microphone is going to be, and we need to be able to track that. now, there is a tracking system that we re using, so whenever we put a microphone on somebody, we also put a tag on that person, and then we can track them in three dimensions. we re not using that live during the show so, instead, we use it as a programming tool. this is the software that we use to do that. each one of these dots represents a microphone. anyone with a microphone has a tracker. so, this is where the musicians are split into two lines. they started at this point, they moved to this point over the duration of this cue, and this cue fires at this timecode value. traditionally, there wouldn t be a loudspeaker system. when massed pipes and drums are p