Radio Trailer Research.

A disadvantage of advertising through radio trailers is that there is no visual representation of the media to present to the audience, which with regards to films that rely mostly on imagery , can be difficult. This means that radio trailers have to depend on other formats to sell films to a mass audience. 

This includes features such as:

• Film Synergy- audio or sound that's also featured in the film.
• Music/sound/narration that represents the conventions of the film
• Narration
• Popular actors/actresses or director's names that will appeal to a wide audience and will also give an insight on what the film in tails 

Film Synergy

By including audio or sound directly from the film, the two products are interlinked and therefore represent each other strongly. This not only suggests to the audience what the genre of the film is, but also what the actual in tails. using dialogue directly film might make the audience question and build suspense as what will happen in the actual film and what it will look like, drawing them into consuming the product. 

Example of film synergy in Gravity

Genre and Conventions

It is important that audience recognises the genre of a film through typical conventions associated by it, so the audience knows what expect visually. For example, in the product in a super natural thriller, suspenseful tension- building music and sounds represent magic, ghosts or space (such as used in the film 'Pacific Rim, panicked voices are heard as well roaring and the sound of running footsteps.) If the audience recognises conventions of the genre they're interest in early in the radio trailer, it will encourage them to watch the film in cinemas. 

Narration 

Voiceovers used in radio trailers are usually distinctive and generally provide the audience with information, such as actors used in the film, and when the release date is. Narration will also use emotive dialogue relevant to the film eg. "but what will happen when..."  "the world is in the hands of.." This helps to build excitement and anticipation for the film's release date and reinforce the suspense that film synergy offers.