Possible Clues:

• Bounced off the walls, as your voice
• Repeated word-for-word
• Bounced back, like sound
• What Beatles music did at Abbey Road, famously
• Bounced back, as a sound
• Copied article removed from each reference book
• Restated
• Said the same thing as
• Went 'Hello ... ello ... llo ... lo ...'
• Did second check in English dictionary