 One of the first films to employ digital audio in the soundtrack.  Much of the music was recorded in New York on a digital system that  digitally encoded two channels onto a video signal, then recorded it  to 3/4 inch video tape. The final mix was analog on the standard six  channel 70mm Dolby surround. The compact disk (CD was just a  prototype in those days. CDs became available in 1982). The dub  began on 3 March 1980.