Editing Stereophonic sound (section)

===Dolby Stereo===
{{Main|Dolby Stereo}}
The Westrex Stereo Variable-Area system was developed in 1977 for ''Star Wars'', and was no more expensive to manufacture in stereo than it was for mono. The format employs the same Western Electric/Westrex/Nuoptix RA-1231 recorder, and coupled with [[QS Regular Matrix|QS quadraphonic]] matrixing technology licensed to Dolby Labs from Sansui, this system can produce the same left, center, right and surround sound of the original CinemaScope system of 1953 by using a single standard-width optical track. This important development, marketed as [[Dolby Stereo]], finally brought stereo sound to so-called ''flat'' (non-[[anamorphic]]) widescreen films, most commonly projected at aspect ratios of 1.75:1 or 1.85:1.