The film was blown up to 35 mm with a "fluid gate" process for theatrical release. The concerts were recorded in 32 tracks and the soundtrack was mixed in Twickenham Studios in England. In its initial U.S. theatrical run it was released in "Quadrasound" which was a variation of the four-track magnetic sound format. Instead of the usual right, centre, left and single surround tracks, Quadrasound fed right and left screen speakers and right and left (split surround) speakers. The objective of the quadraphonic sound recording was to transform the 650 seat motion picture theatre auditorium into the auditory phenomenon of a 10,000 seat rock 'n roll arena. The film began before most audience members even realized it: a black screen and quadraphonic audience noise fooled theatergoers into accepting the recorded ambience as coming from their own venue, intensifying the aural intimacy when the Stones began to play.
The film was sold by The Rolling Stones as a tax-incentive based venture... Read More