The old voice had been given a mechanical monotone deliberately, to make it easier to distinguish from a human voice.

Again the number was given in that mechanical monotone.

It was still eerie to hear grief expressed in that mechanical monotone.

"You will see that Vincent gets these letters immediately," said the voice, speaking in a mechanical monotone.

The words were uttered in a solemn, mechanical monotone, from lips that were expressionless.

The Shadow was watching the expressionless eyes, as the staring man delivered the mechanical monotones.

In response to the stabbed question, Cranston spoke in a mechanical monotone.

His voice was a mechanical, inhuman monotone; he wasn't making the extra effort to get human expression out of his "prosthetic" vocal apparatus.

He also could only speak in a halting, emotionless, mechanical monotone.

In a hollow, mechanical monotone, the foremost of the droids ordered them to throw down their weapons.