The document discusses post-production sound editing for a film trailer. It describes choosing an instrumental hip hop song by Lethal Bizzle that fits the trailer shots and target audience. The sound editor used Final Cut Pro to fade between diegetic dialogue and non-diegetic soundtrack, adjusting volumes to keep the dialogue clear. Feedback indicated the trailer lacked tension, so the editor built it up by fading out the music, focusing on diegetic sounds, and then fading in a heartbeat with shorter shots.