Finally, he closed his eyes and said in a barely audible tone, "I knew."

This time the sound came with more audible tone.

After some little time my uncle spoke, in a low and scarcely audible tone: "Harry, boy, where are you?"

"We are so close," he said in the same barely audible tones.

Some logic probes have a separate audible tone for each of the logical states.

Anne began speaking in a tone barely audible over the shower.

Then he spoke not softly, but in parade-ground tones audible to everyone present.

"You give one to her," he told Kellen in confidential but clearly audible tones.

"I do," Beverly said in the same barely audible tone.

"If there are not more than two men, let's attack," Joe said in a barely audible tone.