Related Clues:

• Pilot's E
• Bounce back, as sound
• Canyon rebound
• Rotunda effect
• Cavern effect
• Tunnel effect
• Amp effect
• Steadily fading sound
• Return call?
• Singer's comeback
• Whom Narcissus spurned
• Sound made by Big Ben
• Audio technician's concern
• Repeated response
• Guitar pedal effect