Vitasound

Vitasound was an experimental theatrical sound presentation system premiered by Warner Bros. in the 1940 film Santa Fe Trail. Vitasound used a second track between the regular sound track and the film's sprocket holes that controlled additional speakers in the theater to create louder sounds for battlefield scenes and the like.

This article is licensed under the GNU Free Documentation License found at http://www.gnu.org/copyleft/fdl.html . It uses material from the Wikipedia article at http://en.wikipedia.org/wiki/Santa_Fe_Trail_(film).