You voice is talks about you.

Timbre,force and height of voice are sharing much about a talking person and his emotional condition.
Moderate sound and vital tone, as here talk is good going, and for an other is good matching, but sometimes is take care,that a person is not trusted for interlocutor, but a sound voice as went out, as calm became, as maybe he is disappointed or offended and his waits are not justified.

Soft,silence,like deaf, soft voice with a low sound to the end.
As he is tired or very sad.

High and ring voice as he is in wish for attack is on the interlocutor, as in many of us causes discomfort such voice as in sense ,that this sound high associating with wordiness.
And also these association with a youthful, and in poor experience, and rare such persons meeting are on the high posts, as lower voice is high post.

Low voice as silence almost, as he is sympathizing to you and trusting, and he needing in sharing with you,that an other not needing knowing this.

Warm,comfortable voice is not high sounds, and not low, as very tryst needing from a side, as reflecting calming and he is very sure and comfort, and he enjoy a talk as on the same.

Cold and non emotional sound, as his character is hard, and he is very sure and not dependence, and he is importance for the business relations and not for the friendship.

And if in talk his sound is changing as a smooth and soft till  thin and squealing,thus these are strong emotions, as from your interlocutor surviving,to think about,what are feared his, or anger,why a theme for talk is not liked?