A professional who operates sound-mixing board to control output of voices, music, and previously taped sound effects during stage performances. Responsibilities include:

• Analyzes script of dialog, music, and sound effects as applied to particular scene to determine sound requirements.
• Confers with producing personnel concerning microphone placement, special sound effects, cues, and acoustical characteristics of theater.
• Locates sound-mixing board backstage or in theater control room.
• Arranges microphones in theater to achieve best sound pickup.
• Moves control to turn microphones on or off and adjusts volume, fader, and mixer controls to blend output of individual microphones.
• Listens to overall effect on monitor loudspeaker and observes dials on control panel to verify suitability of sounds.
• May modify design of sound equipment used.
• May operate record and electrical transcription turntables to supply musical selections and other sound material.