Analysis of information sources in references of the Wikipedia article "トーキー" in Japanese language version.
This system used an operator adjusted non-linkage form of primitive synchronization. The scenes to be shown were first filmed, and then the performers recorded their dialogue or songs on the Lioretograph (usually a Le Éclat concert cylinder format phonograph) trying to match tempo with the projected filmed performance. In showing the films, synchronization of sorts was achieved by adjusting the hand cranked film projector's speed to match the phonograph. the projectionist was equipped with a telephone through which he listened to the phonograph which was located in the orchestra pit.