 In addition to his or her own responsibilities, the A2 often acts as an understudy for the A1.In touring theatre, the A2 is often responsible for overseeing the load-in of all backstage audio elements.In musical theatre, the A2 may or may not be the technical liaison to the orchestra, and duties could include monitor mixing, placement and upkeep of microphones in the orchestra, and video feeds to and from the conductor.