b'Even though the Jazz Singer is credited as the first sound film, sound had been available earlier, but there were too many complications in the presentation. Warner Brothers had also tested it a little earlier in their film Don Juan. For the next few years, sound was presented but mainly in small pieces. The silent films that had been in production just added a few spots of spoken dialogue so they could be called Talking Pictures. Soon the promotions were altered to All Talking Pictures to let the audience know that the entire film had sound. This coming of sound also generated a push for the trailers to be produced with sound. Warner Brothers released the first sound trailers (because NSS didn\'t have the sound equipment). Sam Morris, who was in charge of sales at Warner Brothers, announced that the sound trailers were so successful that they would be adopted as a standard product and would be supplied for all Warner pictures "AT A COST BASIS."Warner Brothers also presented the sound trailers to NSS. The problem was that sound trailers were such a new phenomenon that they didn\'t know how to present it. The Warner trailers were presented like someone talking directly to the audience.In the book, Talkies by Donald Crafton, a LOT more details of this transition are presented. Here is a sample of the dialogue from that book to show the type of presentation that WB used. Ladies and Gentlemen - I am going to impose on your good nature long enough to tell you a few things about a new picture that is coming soon - "Tenderloin."Perhaps you\'ve heard about it and are looking forward to it already. It is one of the first great features put out by Warner Brothers to be presented with lines spoken on the Vitaphone.I don\'t have to tell you what Vitaphone is - the whole world\'s been talking about it since "Don Juan," "Old San Francisco," "The Jazz Singer," and "The Lion and the Mouse." But you will notice that each successing picture brings an advancement in the adaptation of Vitaphone to film drama. "Tenderloin" is a further step in this development. The star of "Tenderloin" is - well, you\'ll recognize her on sight (a wistful closeup of Miss Costello)Dolores Costello - one of the most beautiful and gifted actresses on the screen as well as one of the most popular. And in "Tenderloin" for the first time you will not only see Miss Costello, but you will hear her speak in several dramatic situations in the picture."Tenderloin" is a gripping, tense crook melodrama, full of dramatic situations and colorful with the sinister light of the New York underworld background. It is the poignant love tale of a girl and boy tangled in the scheming meshes of a band of crooks and struggling frenziedly to escape. Miss Costello has the role of a dancing girl in a Bowery dive and the boyfriend is played by the modest individual you see before you - (insert 2)Now don\'t get the impression that "Tenderloin" is all romance - although there is a lot of it in the picture. There\'s action in it - plenty of action. Take a look at this (insert scenes - fight - flood - etc.)'