Sound is energy. This is a highly significant statement that effects you every time you speak to someone. Your tone of voice creates a specific type of energy. A soft and smooth tone of voice creates peaceful energy. An upbeat or joyous tone of voice creates positive energy. Both of these are in stark contrast to an angry tone of voice that creates an angry loop.
When you speak, your tone of voice creates either positive or distressful feelings in the person on the receiving end of that energy. The other person is likely to speak back to you in a tone that is similar to your own. For this reason King Solomon (Proverbs 15:1) advises us: "A soft reply turns away anger." A soft tone of voice has a calming effect both on you the speaker and on the listener.
Do you want others to speak to you in an upbeat tone of voice? Then speak to them that way. A word of caution: For some people an overly enthusiastic tone of voice is too intense. So observe the effects of how you speak and modify your intensity according to the reaction of the listener.
(From Rabbi Pliskin's "Happiness",p.171)