Speak loud, clear, and with pitch.
Speech law #2.
What does this mean?
This law means that you should always speak in a tone that will get ones attention. You also need to speak loud so that the audience can hear you clearly.
What is the purpose of this law?
The purpose of speaking loudly, clearly, and with pitch is to get full attention from the audience, and to be entertaining. Note: No one wants to listen to a monotone whisperer.
Steve Job's Goodbye Speech