I have noticed some people do not really care to the way they speak in. They keep their voice to the same level throughout the entire speech or conversations. I think that is not a good way to speak. Each person can change his voice such as he could scream in excitement if the thing he talks about is exciting, his audience will most likely get excited with him.
Voice changing in any conversation is similar to writing when using bold, Italic, and underline. It lets the writing be more attractive to others and the lets people pay attention to the important things in the writing. I think conversations should be held similar to that way.
Most of the times if a person speaks for long times (even if a person is with friends and family) if he dose not change his voice tone, or way of speech most likely the topic that he speaks about will be boring to others to hear.
The key is for a person to know when to use which tone of his voice in a conversation.
Sadly, I notice most people do not pay attention to the previous thought while it is very Important and it could be applied to any language a person uses to speak in because it lets the topic or conversation a person is talking about more interesting. Every person or almost every person can make his voice louder or less loud then, he should know how can he use that way to to have other people’s true attention to his words.
(What I meant about; True attention: The kind of attention a person gives to others that he dose not checks his mobile or other things, certainly do not interrupts the other person.)