By using the same controller to control two machines, they were synchronised. Townsend thereby effectively used pilottone, a technique that was common in 16mm news gathering whereby a 50/60 Hz tone was sent from the movie camera to a tape recorder during filming in order to achieve lip-synch sound recording.
Through the use of the same controller for both machines, they were brought into sync. Townsend effectively utilized pilottone, a technique frequently employed in 16mm news gathering, where a 50/60 Hz tone was transmitted from the camera to the tape recorder during filming to ensure synchronized sound recording.