The production sound mixer (also called the location sound mixer) is the highest sound position during pre-production and production. They serve as a sound recordist during filming, and are responsible for recording and balancing the audio effects on set. 

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The process includes:

• Choosing what audio equipment to use for the project and providing that equipment.
   

• Visiting the shooting locations ahead of time to evaluate any possible sound difficulties, such as  background noise and high wind susceptibility. For example, heavy traffic nearby or extreme weather conditions due to geographic location (wind, rain, crashing waves).
   

• Hiring and assembling the sound team, which include boom operators, sound assistants, and even sound trainees.

During film production, the production sound mixer:

   •    Records all sound on set, which include all actors’ dialogue during every take, as well as “wild sound,” (location sounds that the post-production team would want to use in the film or as reference)

   •    Mixes audio in real-time, which means balancing the volume and sound quality to ensure the audio will work properly for the final product.

   •    Evaluates the quality of the audio after every take and can request for retakes as needed.

   •    Sets up and takes down all sound equipment.