| Heart chart, for short | 22 |
| Heart printout, for short | 25 |
| Beat reader, for short | 22 |
| Ticker tape, for short? | 23 |
| Ticker tape maker?: Abbr. | 25 |
| One name for a heart test | 25 |
| Lines from the heart?: Abbr. | 28 |
| Lines from the heart, briefly | 29 |
| Heartbeat record: Abbr. | 23 |
| Heart specialist's abbr. | 28 |
| Heart doctor's acronym | 26 |
| Flatline indicator: Abbr. | 25 |
| Cardiology chart, for short | 27 |
| Arrhythmia detector, briefly | 28 |
| Heart charts, for short | 23 |
| Ticker tapes, briefly? | 22 |
| Parts of some ER charts | 23 |
| Med. tests using leads | 22 |
| Heart doc's charts | 22 |
| Troops arranged in a line | 25 |
| Level of responsibility | 23 |
| French for "rung" | 27 |
| Levels of responsibility | 24 |
| Yodeler's feedback | 22 |
| Agree with, as sentiments | 25 |
| Sound in an empty auditorium | 28 |
| Nymph who loved Narcissus | 25 |
| Recording studio effect | 23 |
| Off-the-wall response? | 22 |
| You've heard this before | 28 |
| Yodeler's reverberation | 27 |
| Sound that's coming back? | 29 |
| Bat's navigation aid | 24 |
| Audio feedback problem | 22 |
| Undesirable auditorium effect | 29 |
| Sound in a big, empty room | 26 |
| Nymph spurned by Narcissus | 26 |
| Lingering sound effect | 22 |
| It's been said before | 25 |
| Yodeler's rejoinder | 23 |
| Sound in a long hallway | 23 |
| Sound effect in a cave | 22 |
| Something a yodeler may hear | 28 |
| She pined for Narcissus | 23 |
| Nymph who loved her own voice | 29 |
| Nymph of Greek mythology | 24 |
| It returns your calls? | 22 |
| It may bounce off walls | 23 |
| Be a verbal rubber stamp | 24 |
| Agree with, as a sentiment | 26 |
| "Little Sir ___" | 26 |
| ___ & The Bunnymen | 22 |
| You've heard it before? | 27 |
| Utter an identical sentiment | 28 |
| Sound heard multiple times | 26 |
| Sound heard in a canyon | 23 |
| Sound effect in a valley | 24 |
| Recording-chamber effect | 24 |
| Problem in some concert halls | 29 |
| Off-the-wall feedback? | 22 |
| It will return your calls | 25 |
| It returns to a spelunker | 25 |
| It may bounce off the wall | 26 |
| It comes back to a spelunker | 28 |
| Dolphin's navigation aid | 28 |
| Delay/reverb's cousin | 25 |
| Audio feedback, of a sort | 25 |
| Audio feedback of a sort | 24 |
| Yodeler's response? | 23 |
| Yodeler's elicitation | 25 |
| Yodeler's counterpoint | 26 |
| Yodeler's accompaniment | 27 |
| What a well may produce | 23 |
| Vowel in the NATO alphabet | 26 |
| This may follow a stimulus | 26 |
| Stairwell sound effect | 22 |
| Sound in an empty room | 22 |
| Sound in an empty hall | 22 |
| Sound after call waiting? | 25 |
| Singer's comeback? | 22 |
| She wept forNarcissus | 22 |
| She doted on Narcissus | 22 |
| Returning waves, of sorts | 25 |
| Return from the Grand Canyon? | 29 |
| Return from the canyon? | 23 |
| Return from a mountain? | 23 |
| Response to a cave shout | 24 |
| Recording-studio effect | 23 |
| Recording booth effect | 22 |
| Pilot's "E" | 25 |
| Off-the-wall reaction? | 22 |
| Nymph who loved and lost | 24 |
| Nymph rejected by Narcissus | 27 |
| New Wave band Pseudo ___ | 24 |
| NATO alphabet "E" | 27 |
| Narcissus's admirer | 23 |
| Me-tooer's response | 23 |
| It's on the rebound? | 24 |
| It will come back to you | 24 |
| It may return your calls | 24 |