Used broadly for tone of voice, color, atmosphere, or sound, similar to English 'tone'. Common in compounds like カラートーン (color tone) or トーンダウン (tone down).
The tone of his voice suddenly changed.
I like the calm tone of this room.
He raised his voice in anger.
Since the criticism was harsh, he toned down his remarks.
I matched the tone of the walls and the furniture in the room.
This picture is painted in bright tones.
Her voice gets higher in tone when she's excited.
tone detection