The so-called variables, or modulations of tone, are under the direct influence of our mental and emotional state. That is why it is so important that we have a topic we know and a topic we are excited about when we go before an audience. That is why we must be so eager to share that topic with our listeners. Since most of us lose the spontaneity and naturalness of youth as we grow older, we tend to slip into a definite mold of physical and vocal communication.
