Possible Clues:

• Quality of sound of the voice
• By the sound of it, the end of the wood it twisted
• Quality of voice, sounds wooden
• How the wood turns tail to give it tone
• Quality of tone
• How the end of the wood is twisted to give it tone
• Tone-colour
• Medic beset by fatigue needs to acquire tone
• Distinctive tone
• By the sound of it, the end of the wood has got twisted