What is often overlooked when the discussion of the end of the silent era is had, or colorization for that matter, is that experiments with both color and sound occurred quite often before technology progressed such that it became a more practical feat.
Many know that quite a few silents were hand tinted, which is to same the color was applied frame-by-frame as desired. However, sound experiments often occurred also. Usually by implementing a technique called sound-on-cylinder. This film is believed to be the first to implement both as a scene from Cyrano de Bergerac plays out.