Recording & Editing
Radio, like moving image, is LINEAR and SEQUENTIAL, in that it moves in a chronological order, from (a) beginning to (an) end. In this respect, it is important to refer to NARRATIVE THEORY when trying to understand and de-code radio meaning. Radio is also reliant on sequential editing techniques (unlike print or on-line media). As such, basic grammar around the cut, the fade and the dissolve are important elements in constructing meaning.
You can also apply a range of sound processing techniques in a post-production audio editing programme such as Adobe Audition. This way you can build up a number of audio files to create a mix of sounds and you can process each sound to alter equalisation, tone, timbre, dynamic. Editing can transform the raw material that you gather in the production stage into multi-track (multi-layered) final production that you would generally export as a .WAV file to either broadcast or embed in a multi-media production (eg moving image product, on-line media product etc). Your multi-track allows you to make choices (thereby create meaning) around sound levels / volumes and relative sound balance between individual sound files. The priorities that you give each file is a way of creatively constructing meaning.