Answer: It will sound understandable and interesting
Step-by-step explanation:
When the narrator is talking more fluently, that is sure, understandable for those who are reading or listening. The more fluently the narrator is speaking, the more understandable would be the story and the story's point of view.
When someone is having heightened voice it is giving us a feeling of someone who is trying to be interesting and recognized. This kind of voice is the best for expressing vocal or human emotions and it is very useful for the narrator.