ROUTE OF BELT ON CANVAS, or how to actually translate movies

In every theater it used to be before the same movie. Whirring hall after first Lights switched to a whisper, and after hearing the other side sound, completely silent. The sound is usually heard by a few seconds before the screen went first image and the end of the film has faded away. There were lights in the back of the audience, the illuminated slit, which was the only link a cinema projectionist's cabin.