Related Clues:

• Mulling sound
• "I wonder ..."
• Sound of deliberation
• Muse emanation?
• 'Let me see, ...'
• 'Good question'
• "Let me think about that"
• "I'm not sure"
• "Let me think . . ."
• "I'm thinking ..."
• 'Let me think, ....'
• 'Let's see ...'
• "That's curious . . ."
• A musing sound
• "That's curious ..."