Dialogue/speech: This is the spoken audio used, this includes scripted which is used and planned in the moving image. Unscripted which is the equivalent of improvisation as the person speaking is making it up on the spot. Then there are also voiceovers which tend to be scripted but go over the footage and are not present in the scene filmed. The effect of using this is to help explain the scene but also add more depth and content, it can get confusing in terms what is being shown so words add clarity. This is mostly because expressions and emotions performed can cause confusion as to what is actually going on. Emotions can be expressed better through the words used.
Music: This is present to fill the silence and can be used to build tension and suspense if used as a backing track. It can also be used as a theme tune but can diegetic and non-digetic too. It can be present in the scene like if it is coming from a stereo or it can be added in after during editing. Composed music can be used to make a film or programme recognisable such as ones that are made into a big franchise or merchandise. One example would be Star wars which has very famous composed music for it. The effect of having composed music is that it gives a product of form of label and makes it distinctive, it also attracts a particular type of audience. can create various effects like fear, drama and even simply fill where there is a gap. If someone is creeping around without talking, you want music there to build the mood and atmosphere.
Sound effects: These are used to add drama as they can emphasis an action like someone being stabbed or they can simply explain an action if the scene is unclear in the first place. An example would be a car back firing without the sound of shotgun, if you only see the imagery it would seem very strange as there is no way you wouldn't hear it. Therefore sound effects effect how the product is presented as it changes the way you see it and understand it.
Wild track: This is used to make a sound louder when it cannot be recorded clearly at the time in the scene. It also adds more emphasis to an action and can add clarity. The effect of using a wild track is that it can make filming easy as you don't need to worry about the little details at the time of filming. This means that the sound elements can be recorded after the shooting.
Silence: This again is a tension building technique as the silence can be more deadly, than a loud noise. Ever heard the expression 'It's too quiet' this is the same sort of concept as silence can be more scary than noise. Therefore the effect of using silence is to build suspense and tension, but also actual fear too this is where stings can become very effective, as they tend to follow silence or light paced music.






