Modulation of voice, also known as vocal INFLECTION, is the process of changing the pitch, volume, and tone of one's voice to convey emotion or emphasis. This can be done through the use of inflexion and INFLECTION. Inflexion is the process of changing the pitch of one's voice to emphasize certain words or phrases. INFLECTION is the process of changing the volume and tone of one's voice to emphasize certain words or phrases. Both of these processes are used to create a more expressive and engaging vocal performance.