The document discusses the roles of sound designers and sound mixers in theatrical productions. The head of sound is responsible for all audio aspects and performs soundchecks before performances to ensure all microphones and speakers are working properly. Sound designers craft the soundscape of a production to help tell the story and bring the show to the audience. They control wireless microphones and work to make voices and music seem like they originate from the stage rather than speakers. Sound mixers perform each show without breaks, mixing vocals, instruments and effects according to cues.