How to influence people with your voice

Let’s say you are going into a business meeting to close a big deal

 or you are going into an important meeting.  Let’s say you want to influence everyone. 

You begin your story but you notice no one is listening.  Is it me? Is it the deal?

Could it be my presentation?  Most likely you are not moving them emotionally.  

How do you move them emotionally?  With your voice.