It was recorded using a separate machine that was often located in a central building on the lot but very much at the same time. When I was working in film during the '90s I was told dialogue replacement in the original language is a recent development having to do with the introduction of very portable cameras and a declining number of sufficiently quiet production locations. I recently saw a number of very early sound pictures and was floored by how little has actually changed in the way movie sound is done. It was almost all invented within a very few years. Bob Olhsson Audio Mastery, Nashville TN Mastering, Audio for Picture, Mix Evaluation and Quality Control Over 40 years making people sound better than they ever imagined! 615.562.4346 http://www.bobolhsson.com http://audiomastery.com -----Original Message----- From Don Cox: Am I right in thinking that the dialogue in classic Hollywood movies was almost always recorded separately - that is, not at the same time as the images were recorded ?