Interesting origin of "stereo" sound perhaps...

Trivia for "Napoléon Bonaparte" (1934) Although the soundtrack to this 1934 release is sometimes called stereophonic, Daniel J. Sherlock writes, "The use by Abel Gance of 'stereophonic' sound in the 1930s was actually a process where notches in the film would trigger a sequencer that would turn on and off various surround speakers for enhanced dramatic effects. All speakers were driven by the same monophonic soundtrack." "Napoléon Bonaparte" (1934) Directed by Abel Gance Writing credits Abel Gance (dialogue) Abel Gance (screenplay)