Editing is the process of assembling raw film footage into a final cut by adding effects, dialogue, and music. Early editing involved physically cutting and pasting film prints together, which was tedious. Continuity editing developed techniques like matching cuts to action to flow seamlessly between shots without noticing edits. Montage editing introduced fast-paced cutting and other techniques to Eisenstein's 1925 film Battleship Potemkin. Alternative methods later emerged like French New Wave's long takes and jump cuts. The Jazz Singer in 1927 was a milestone with synchronized sound, heralding the decline of silent films. Modern editing uses non-linear systems to edit digitally stored media rather than physical tapes.