• Alpine sounds
• Audio effects
• Bounces back
• Canyon cacophony
• Canyon caroms
• Canyon comebacks
• Canyon effects
• Canyon returns
• Canyon sounds
• Cave comebacks
• Comes back
• Comes back the same
• Dolphins' signals
• Empty hall sounds
• Empty stadium effects
• Feedback
• Fills a chamber, in a way
• Has a lingering effect
• Hints of the past
• Hollow replies
• Identical responses
• Imitates
• Includes elements of
• Lingering traces
• Mountain sounds
• Parrots
• Parrots, in a way
• Radar blips
• Rebounding sound waves
• Rebounding sounds
• Reiterates
• Repeated sounds
• Repeats
• Resonates
• Resounds
• Responses to 'hello,' possibly
• Reverberates
• Reverberations
• Reverberations in a concert hall
• Rings
• Second comings?
• Some sound effects
• Sonar blips
• Sonic boomerangs
• Sonic returns
• Sound reflections
• Sound technician's worries
• Sounds in an empty hall
• Spooky sounds
• Talks back?
• They may be found in long halls
• They repeat whatever you say
• They travel at the speed of sound