Then he allowed his voice to take on a more normal tone.

He cannot say anything in a normal tone of voice.

He could barely force the words into a normal tone.

Ask him to say it again in a normal tone of voice.

We'd been talking in normal tones and the car windows were open.

He looked at the leader again and dropped to a normal tone.

Speak slowly and simply in a normal tone of voice.

I'd never have talked to a girl about this in such a normal tone of voice.

With the next words her voice returned to its normal tone.

It was a moment before he could speak in a normal tone of voice.