Here is an interesting article about voice pacing on the BBC web site. Researches analyzed voice patterns of 1,400 attempts to get people to do a phone service. Here they are:
- Speak moderately fast
- Don't change the pitch of your voice too much
You could re-write these findings as follows:
- Be energetic and enthusiastic
- Don't rattle off a pre-programmed script
- Act normal
In short, have a human conversation.