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Tapping on the transition icon will allow you to specify the length of the transition (0.5s, 1.0s, 1.5s, 2.0s) and select between your theme's special transition - a tradition cross dissolve, or no transition at all. IMovie will automatically add transitions between clips and photos. Double tapping an inserted photo gives you options to give the photo a title style (opening, middle, ending) and to add a location. Inserting photos is achieved in the same manner as adding videos and audio. Double tapping any audio clip with give you option to adjust the volume or delete the clip.
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Choosing when they play in your movie is as simple as dragging them along the timeline. The good news is that these effects are stackable and you can have up to 3 audio tracks playing at a time (including background music). IMovie comes with a lot of sound effects pre-installed. Your song must start at the beginning of the movie and it must play until the song or movie is over, whichever comes first. You can then have a new song start after the first one is finished, but you cannot control the length of the clip nor choose when you want the song to start. Music audio tracks are limiting in that you cannot add more than one song to your movie unless your movie is long enough to play an entire song.
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