The referenced video of this post is an interview done by Stefan James with Roger Love.
Just to take note and apply it to my next speaking sessions, here are the three main points that may immediately applicable for me:
1. Three range of tone of speaking to make the talk more interesting: (should be lower and slower for me)
2. Pause and breathe in with nose instead of mouth between sentences or commas.
3. Don’t limit my voice to the microphone; Project my voice to vibrate the bodies of the far audience.