Paralingual means

     To make speech effective and interesting, certain techniques can be applied. Words convey meaning, but the way that they are said reflects feelings and emotions. Vocal variety can be achieved by variations in:

• Pace: This is the speed at which you talk. If speech is too fast, then listeners will not have time to assimilate what is being said. It is also a good idea to vary the pace - quickening up at times and then slowing down – because this will help to maintain interest.
• Volume: By raising or lowering volume occasionally, you can create emphasis. If you drop your voice to almost a whisper (as long as it is projected) for a sentence or two, it will make your audience suddenly alert. Be careful not to overuse this technique, though, or it will lose its impact.
• Pitch - Inflection - Emphasis:  When speaking in public, try to convey the information with as much vocal energy and enthusiasm as possible. This does not mean your voice has to swoop and dive all over the place in an uncontrolled manner. Try to make the talk interesting. Remember that when you are nervous or excited, your vocal chords tense and shorten, causing the voice to get higher. Emphasise certain words and phrases within the talk to convey their importance and help to add variety.
• Pause: Pauses are powerful. They can be used for effect to highlight the preceding statement or to gain attention before an important message. Pauses mean silence for a few seconds. Listeners interpret meaning during pauses so have the courage to stay silent for up to five seconds – dramatic pauses like this convey authority and confidence.