SOUNDTRACK AND EFFECTS
Other than the voice-overs, which we had completed during the filming of our production in the actual scenes, I had to gather sound effects of things like gun-shots or the punching that occurred during the action scenes within the trailer. Some of these sound effects are hard to find, such as gun-shots, so I had to find these sound effects free of use from the internet, this was easily done through a website called freesound.org, a site which holds a variety of sound effects, which are free to download if you signup.
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Some sounds however, could be
made through Foley, Foley is the reproduction of everyday sound effects that are added to film, video, and other media in post-production to enhance audio quality. These reproduced sounds can be anything from the swishing of clothing and footsteps to squeaky doors and breaking glass.
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After searching for gun shot sounds, a list of soundclips showed up that I could download, all I had to do was choose a suitable one, appropriate for the gun and the sound it makes when it is shot.
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EDIT: Following feedback from one of my friends, one of the gunshots that I used was quite high-pitched and squeaky, so I had to replace the sound effect with a gun shot that produced a larger bang, enough to intimidate the audience and exaggerate or amplify the sound of a gun being shot. This makes the shot more dramatic and gives the scene more depth.