Her voice revealed how desperately she wanted to believe in that chance.

The huge sergeant's voice reveals none of his fury at the near miss.

Then, obviously realizing what his face and voice were revealing, he looked away.

He was astounded, though his voice revealed nothing of the sort.

The voice would be heard by all, and might reveal what Killeen should do next.

She made sure her voice revealed little of what she was feeling.

To someone schooled by a life of observation, that voice had revealed a great deal.

Only his gruff voice revealed it was indeed the same person; everything else about him had changed.

If she was afraid of him, her voice didn't reveal it.

The most commonly cited reason for this is that their voice may reveal them.