Also, the stress in the young man's voice had changed the timbre.

You may get exactly what you want.' Galliadal again changed the timbre of his voice when he spoke as the mother.

Kemper had merely changed the timbre of his snore to a whistling aria, which at any other time would have enraged me.

"'We have come looking for food,' the eldest visitor explained." Galliadal changed the timbre of his voice when he spoke as the young woman.