Hi This is part of the costal breathing technique and does make a big difference. If you say a word place your hand on your throat and then say the same word again with your hand on your chest. You will be able to quickly identify, through subtle vibrations whether the sound is coming from your throat or chest. You will have greater control when you speak from your chest in a deep tone. Practice and you will be able to "train" yourself to talk in a deeper tone from your chest.