The final edit of a film soundtrack that can be transferred directly to a track negative or a mag stripe print with no further changes in level or EQ. If noise reduction is used on a print master, it most often matches that of the final print format, and thus can be transferred stretched to the mag stripe print or track negative. In the case of a stereo optical film, the print master contains two tracks, Lt-Rt, that are transferred directly to an optical sound negative. The soundtrack of a discrete 35mm 4-track or 70mm 6-track mag print will be recorded from a 4- or 6-track printing master in a real-time transfer. Also called a running master.