We used a lot of sound effects and added both studio recorded vocals and audio from the movie itself. We used garage band on a mac as it is a very easy piece of software to use and we could get a lot of desired effects.
By using a lot of layers of different sounds and effects, we were able to make the trailer very realistic. By using vocal clips from the movie we also created an enigma which will pull the audience in and make them want to watch the movie to see how the enigma is resolved.

