Related Clues:

• Distinctive quality
• Strengthen, with 'up'
• Voice nuance
• A security
• Quality of voice
• Pre-dial sound
• Do, re or mi
• Singer's concern
• Phone sound
• Semiquaver, e.g.
• Whole note, e.g.
• Do on a scale
• Musical notation
• A,B,C or D
• Record, in a way