Historical clue formulations

• Returns a call, in a way — 2025-03-30
• REPEATS, repeats, repeats … — 2023-11-29
• Makes a comeback? — 2021-10-17
• Sounds heard in canyons — 2021-05-24
• Bounces off the wall, say — 2019-08-21
• Diminishing returns? — 2018-12-16
• Offers a similar opinion to — 2018-06-08
• Repeats word for word — 2016-11-07
• Hollow replies — 2010-06-26
• They repeat whatever you say — 2010-05-13
• Comes back the same — 2008-12-14
• Repeats — 2007-10-11
• Sounds in an empty hall — 2006-10-09
• Feedback — 2006-04-01
• Hints of the past — 2005-06-17
• Talks back? — 2004-10-24
• They may be found in long halls — 2002-01-04
• Sound technicians' worries — 2001-11-11
• Parrots, in a way — 1998-12-08
• Alpine sounds — 1997-06-25
• Sonar blips — 1995-12-21
• Radar blips — 1995-11-05
• Bounces back — 1995-02-16
• Rings — 1994-09-25
• Reverberations — 1994-05-23