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Controllers and control boards are devices designed to manage events and presentations by giving an operator the ability to select, modify and output video and audio sources to different output components. There are both video and audio controllers. Controllers are essential for complex presentations and for controlling multiple displays simultaneously. The main job of a multimedia audio controller and video controller is to allow the selective outputting of different sources. This can include controlling a matrix of displays on a video wall. The operator can select which sources reach a speaker or monitor. Most will convert formats as well.