The head of the sound department on the set. They are responsible for the process of recording all sync dialogue and sync sound effects in a scene. The Production Sound Mixer has a number of duties: selection and operation of the microphones, and recording equipment used on the set, directing the boom operator, combining the sound of multiple microphones used to capture dialogue and effects on a set, recording sound ambiance and room tone for all scenes, and wild track that will aid the editor and sound mixer in matching the different sound takes in a scene for smooth sound transitions.