Related Clues:

• Nymph of myth
• Identical response
• Sonic ricochet
• Silo sound
• Return of a sort
• Off-the-wall response
• Feedback, of a sort
• Quick comeback?
• Sound effect
• Sonic boomerang
• Confirm, as a password
• Sonic remnant
• Audio feedback, of a sort
• Alpine bounceback
• Repeat performance?