Paralingual means

     Some people have naturally soft voices and physically cannot bellow. Additionally, if the voice is raised too much, tonal quality is lost. Instead of raising the voice, it should be 'projected out'. Support the voice with lots of breath - the further you want to project the voice out, the more breath you need. It also needs to come from the diaphragm, not the throat.

     When talking to a group or meeting, it is important not to aim your talk to the front row or just to the people nearest you. Instead, you need to consciously project what you have to say to those furthest away. By developing a strong voice, as opposed to a loud voice, you will be seen positively.