Glossary A AD Assistant director. The person in charge of the shooting schedule, directing the extras, keeping the actors on time, and the right hand man to the director. ADR Automatic dialog replacement (looping). This is done on a looping (recording) stage to rerecord dialog after the film is completely shot to replace unusable original sound, change performance, or add new dialog. ALTS Alternate takes. AUDIO LAYBACK After the movie is mixed on the dub stage, the tracks are applied to the film in an optical track (in film) or to the audio tracks on the video master (CTM). B BACK NINE The last nine episodes of a TV show ordered for pickup by the network.