Related Clues:

• Mute, with 'down'
• Speech subtlety
• TV color adjustment
• Sculpt, at the gym
• Time signal, maybe
• Fine-tune, as muscles
• Normal elasticity
• Muscle or musical quality
• A kid may be told to watch it
• Vocal quality
• Speed of sound
• The sound of music
• Firm up, as muscles
• Work on one's muscles
• Vocal pitch