Abstract: A personal computer having a timing decoder and a graphics overlay card is programmed to interpret a script written in accordance with a predetermined grammar or format. A pair of tape decks, one for playback and one for record, are connected to the graphics overlay card. The script is stored in the computer and read or interpreted by the computer, which generates control signals to operate the graphics overlay card. The tape decks are run without pausing and the editing operation takes only as long as a normal copy. There is no operator intervention.