Related Clues:

• Adjust, as an engine
• Whistler's product
• Adjust the dial
• Good thing to be in
• Bring into pitch
• Pull some strings?
• Jingle
• ''Name That __''
• Some people can't carry one
• Something to whistle
• MP3 download
• Singer's selection
• Pitch properly
• Air or number
• Some find it hard to carry