On the phone, you can tell if a person is lying down, sitting or walking, by the tone of their voice.
On the phone, you can tell if a person is smiling, frowning, scared or not even paying attention, by the tone of their voice.
On the phone, you can tell where a person is, by the tone (and echo) of their voice.
Even written words have tone. Writers use tone all the time, to set scenes.
In an email, you can tell intent by the tone of the words.
Tone is the lever in communication.
– Osasu Oviawe