@askvinh: Growing up I was quite emotion-less and I remember working at a theatre, and the teacher at the time called me "stone-face" because I barely showed any emotion. And this led me to having a monotone voice - because a monotone voice comes from a monotone face or body. So if you want to move your voice, you have to move your face! The facial expressions you make will affect the emotion in your voice and therefore move your voice.