mechanically,  corresponding the projection speed with the recorded disc by  utilizing the same motor for both devices. While cumbersome in both  recording (editing was impossible) and play back (discs were  fragile), Vitaphone represented the peak of technological  innovation, albeit briefly. Don Juan, the first Warner Bros.  feature to utilize the Vitaphone process, debuted in a gala premiere  on August 6th 1926 and while it was a hit, it signaled a industry  format war unrivaled until the 1980s Beta vs. VHS battle. Warners  The Jazz Singer would become a monster hit 13 months later solidly  proving the publics interest in sound. But there were several sound  systems then in development and none were interchangeable and the  major outfits like MGM and Paramount adopted a wait and see attitude  that persisted well into 1929. The most practical, Foxs Movietone  (sound on film) system eventually won out and Warners abandoned  recorded discs in 1930 but kept the Vitaphone trademark before the  public into the 1940s.