The sound crew works with the director and stage manager in constructing the sound concept
and playback for the show, and with the technical director to set up sound equipment for the
running of the production. In addition, the sound crew installs and maintains all equipment relating to the technical operations of the orchestra pit, including stand lights. There are at least two members of the sound crew that actually run the sound for the production: the sound
engineer, who sits in the ``crow's nest`` and controls all sound levels; and the sound board/
playback operator, who operates playback and other functions in the control booth. In addition, there are usually RF technicians that place and maintain wireless mic units for all cast members.