Related Clues:

• Voice quality starts to become resonant eventually?
• (A sound's) character
• Build muscles, with 'up'
• Mood indicator
• Step on a scale
• Musical pitch
• Voicemail signal
• Rice gets British capital for Evita — or The Sound of Music
• Distinctive tone
• Tone-colour
• Note variation in the sound
• Turning the key, not making a sound
• Pitch (sound)
• Brother within minute, say, produced tonal quality
• Medic beset by fatigue needs to acquire tone