| Kind of cardiogram | 18 |
| It's repetitive | 19 |
| It's often tested by shouting "Hello!" | 52 |
| It will return your calls | 25 |
| It returns your calls | 21 |
| It returns to a spelunker | 25 |
| It may bounce off the wall | 26 |
| It comes back to a spelunker | 28 |
| Gymnasium sound | 15 |
| Grotto sound | 12 |
| Empty-hall sound | 16 |
| Empty room phenomenon | 21 |
| Empty hallway sound | 19 |
| Double talk? | 12 |
| Dolphin's navigation aid | 28 |
| Delay/reverb's cousin | 25 |
| Dali's "Nostalgic ___" | 36 |
| Chamber bouncer | 15 |
| Cave effect | 11 |
| Canyon reply | 12 |
| Bounced response | 16 |
| Bounceback | 10 |
| Audio problem | 13 |
| Audio feedback, of a sort | 25 |
| Audio feedback of a sort | 24 |
| Audible bounceback | 18 |
| Answer in kind | 14 |
| Alpine response | 15 |
| Alpine feedback | 15 |
| Acoustical bounce | 17 |
| "Anybody there? . . . there? . . . there?" | 52 |
| You may test for it by saying ''Hello!'' | 56 |
| Yodeler's response? | 23 |
| Yodeler's feedback, perhaps | 31 |
| Yodeler's elicitation | 25 |
| Yodeler's effect | 20 |
| Yodeler's delight | 21 |
| Yodeler's counterpoint | 26 |
| Yodeler's accompaniment | 27 |
| Words that resonate? | 20 |
| What a well may produce | 23 |
| Waves back? | 11 |
| Water well feature | 18 |
| Vowel in the NATO alphabet | 26 |
| Verbal feedback? | 16 |
| Unhappy nymph | 13 |
| This may follow a stimulus | 26 |
| The bouncing bawl? | 18 |
| The "E" in NATO's alphabet | 40 |
| Steadily fading sound | 21 |
| Stairwell sound effect | 22 |
| Sound-editing problem | 21 |
| Sound phenomenon | 16 |
| Sound in an empty room | 22 |
| Sound in an empty hall | 22 |
| Sound in a tunnel | 17 |
| Sound heard in an empty hallway | 31 |
| Sound feedback | 14 |
| Sound bounce | 12 |
| Sound after call waiting? | 25 |
| Sonic ricochet | 14 |
| Sonic remnant | 13 |
| Sonic rebound | 13 |
| Sonic phenomenon | 16 |
| Sonic feedback | 14 |
| Sonic effect | 12 |
| Sonic copy | 10 |
| Sonar's principle | 21 |
| Sonar return | 12 |
| Sonar principle | 15 |
| Sonar comeback | 14 |
| Something repetitive | 20 |
| Small Toyota model | 18 |
| Slapback, e.g. | 14 |
| Sir of song | 11 |
| Singer's comeback? | 22 |
| Singer's comeback | 21 |
| Silo sound | 10 |
| She wept forNarcissus | 22 |
| She loved Narcissus as much as he did | 37 |
| She doted on Narcissus | 22 |
| She adored Narcissus | 20 |
| Second hearing? | 15 |
| Second go-around | 16 |
| Say the same thing as | 21 |
| Rotunda effect | 14 |
| Role in "Ariadne auf Naxos" | 37 |
| Reverb's cousin? | 20 |
| Rever-berate | 12 |
| Returning waves, of sorts | 25 |
| Returning sound | 15 |
| Returned waves? | 15 |
| Return to the Alps? | 19 |
| Return of a sort | 16 |
| Return of a call? | 17 |
| Return from the hills | 21 |
| Return from the Grand Canyon? | 29 |
| Return from the canyon? | 23 |
| Return from the Alps? | 21 |
| Return from a mountain? | 23 |