The Sound Mixer is responsible for recording and mixing the audio on set. They are responsible for setting up and operating audio equipment, and for capturing clear audio that matches the creative vision for the project. The sound mixer works closely with the director, sound designer, and boom operator to ensure that the audio is consistent and cohesive. They will also consider factors such as the length of the video, the number of sound sources, and the budget and schedule when setting up and operating audio equipment.