1. A production sound mixer, location sound recordist, location sound engineer or simply sound mixer is the member of a film crew or television crew responsible for recording all sound recording on set during the filmmaking or television production using professional audio equipment, for later inclusion in the finished product, or for reference to be used by the sound designer, sound effects editors, or foley artists. This requires choice and deployment of microphones, choice of recording media, and mixing of audio signals in real time.
The recordist may be asked to capture a wide variety of sound on location, and must also consider the format of the finished product (mono, stereo or surround sound). The recorded production sound track is later combined with other elements or re-recorded by automatic dialogue replacement.