Voice Doubling

Here is a nice image of voice doubling in the early sound era. Here, the doubling is being done live. It could also be "predubbed"—that is, prerecorded—with the actors lip-syncing to playback or "postdubbed"—that is, a voice rerecorded through "looping" after the filming. In 1929, mixing in postproduction was technically possible but unreliable, and so was not common. When postdubbing was used, generally the entire performance (rather than just the voice) had to be redone.




Image source: Photoplay, June 1929