A type of sprocketed tape recorder/playback machine device that reproduces one or more audio tracks onto the magnetic area of magnetic film which has a magnetic stripe. A playback-only machine for sprocketed magnetic film, reproducing one or more tracks of sound onto the magnetic area on the film stock. Some mag dubbers which are equipped with dual sets of sprockets can reproduce more than one size of magnetic film, e.g., 16mm and 35mm. See mag-optical print.