At first, the magnetic stripe had to be applied after the film was processed and recorded on a suitable projector. In the 1970s, cameras appeared which were able to record live sound directly onto pre-striped film. This film was loaded into oversize cartridges that provided access for the camera's sound recording head. The camera would also accept non sound cartridges, but silent cameras could not accept sound cartridges. One major advantage of the Super 8 system was that as the camera pressure plate was a part of the cartridge, it could be moulded to the profile of the stripe(s)s on the film.