I heard the tone of her voice, not the words.

The person will be able to hear the tone clearly.

He turned his head quickly, hearing the tone of my voice.

The guy might not have understood, but he heard the tone.

Maybe if we heard the tone of his voice we'd change our minds.

He did not look at her, but she heard the softer tone in his voice.

He heard the tone, knew her well enough to interpret it.

He heard his own stiff tone and didn't like it.

He could hear the tone of doubt in Willie's voice.

Pablo looked at him quickly when he heard the tone of his voice.