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Kim Hyuk Gun's Research on Vocal Technique 20/24 · Support: The Exhale Is the Sound

Support is not holding your breath but the technique of managing the exhale — the breath is held in two places, at the diaphragm and at the glottis.

2026-10-30 · 4 min read

▶ This part's vocal lesson

Cross Kim Hyuk Gun Vocal Lessons, How to Sing Well Ep. 7: Support and Tone Control · 뮤토리 (Mutory)

Part 20 of 24Kim Hyuk Gun's Research on Vocal Technique (24 parts)

This series reads Kim Hyuk Gun's doctoral dissertation, 「횡격막 마비군과 비마비군을 통한 복식호흡과 발성법 연구」 ("A Study of Abdominal Breathing and Vocal Technique in Groups With and Without Diaphragmatic Paralysis," Kyung Hee University, 2019), in 24 parts for popular-music vocal students, pairing each part with one of the vocal lessons he taught. The study was approved by the Kyung Hee University Institutional Review Board (IRB; project no. KHSIRB-17-047) and was carried out as a human-subjects experiment with the informed consent of its participants.

At a Glance

  • Kim Hyuk Gun's doctoral dissertation (2019) concludes that "the exhale is the sound, and support is the technique of the exhale."
  • Another name for support is a conscious, slow exhale — or restrained exhalation.
  • Only once you can keep good posture and breathing and your singing is skilled can you consciously influence the exhale, the dissertation writes.
  • The exhale is controlled by the tension in the diaphragm created by a deep inhale, and by narrowing the glottis once more at the vocal folds.
  • Support training is needed to keep the sound steady without wasting breath and to move into high notes.

Quick AnswerKim Hyuk Gun's (김혁건) 2019 doctoral dissertation explains support as a conscious, slow exhale — restrained exhalation — and concludes that the exhale is controlled, without wasting breath, by the diaphragm tension a deep inhale creates and by narrowing the glottis once more.

Diagram of support: the exhale controlled in two places, by diaphragm tension and by narrowing the glottis

Contents

  1. 01Support: A Conscious, Slow Exhale
  2. 02The Exhale Carries the Sound
  3. 03Holding the Breath in Two Places
  4. 04A Sound That Wastes No Breath
  5. 05Today's Practice
  6. 06Where to Go Next

In 2019, Kim Hyuk Gun (김혁건), the vocalist of THE CROSS (더크로스), defined support in his doctoral dissertation like this: "The exhale is the sound, and support is the technique of the exhale." And he wrote that training in support forms the main part of vocal education.

This is the twentieth part of the series. Following posture and correct breathing in Part 19, it sets out the next step — support, which manages that breath through the whole song.

01.Support: A Conscious, Slow Exhale

The dissertation writes that support does not come from the start. It does not happen ordinarily, but once you can keep good posture and breathing and your singing becomes skilled, you can at last consciously influence the exhale — and this process is called "support."

NameThe dissertation's explanation
SupportAn important element of singing and an essential part of singing education
Conscious, slow exhaleAnother name for support
Restrained exhalationThe process of controlling the exhale with diaphragm tension and by narrowing the glottis

Season 1, Episode 5, "Singing Technique," seen in Part 1, also describes support as "restrained exhaling" in its description.

02.The Exhale Carries the Sound

The dissertation shows that the exhale carries sound through a simple observation. If you close your mouth and block both nostrils and try to make a sound, no sound comes out; open only one nostril and sound comes only from there; block the nose and open the mouth and it comes only from the mouth (Part 10, section 04). In the end, it is the exhale that sends the sound out.

The dissertation's explanation
SoundIs the vibration of air
ToneNot only in singing but in speech, you can have many tones depending on how you adjust the exhale
ResonanceYou can change the tone by making the air resonate in the throat (pharynx) or the nose (nasal cavity)
ContactAir on its way out strikes the tongue, teeth and lips, creating many changes of tone
The endWithout breath you cannot sing, and once the breath is used up it is hard to make any more sound

So the dissertation concludes: adjusting the exhale and controlling the vibration of the air — that is the breathing technique of singing.

03.Holding the Breath in Two Places

After quoting Caruso — "My voice comes from the lower abdomen" — the dissertation explains the principle of support as two kinds of control.

  1. Diaphragm — For a steady exhale, take a deep inhale, and use the tension in the diaphragm it creates to control the exhale.
  2. Glottis — At the vocal folds, narrow the glottis once more so it vibrates, controlling the exhale.

This process is called support, or restrained exhalation, the dissertation writes. By narrowing the glottis at the vocal folds you can hold the breath coming from the lungs so it does not simply go out, and it is important to feel the difference in quality and resonance between a closed and an open glottis, it adds.

The two places — the diaphragm below and the glottis above — are the same two forces as the "balance of force between the vocal folds and the diaphragm" in Part 6 and appoggio in Part 18. Support is keeping that balance for the length of a note.

04.A Sound That Wastes No Breath

"Support training is needed to keep the sound steady without wasting breath and to move into the high range." The dissertation ties the purpose of support into three.

The purposes of support
Wasting no breath
Keeping the sound steady
Moving into the high range

It then quotes García: "A fine singer can hold a candle in front of the mouth while singing without the flame flickering." The breath goes out as sound, and breath that has not become sound does not leak out.

Ways to practice support are found throughout the dissertation too. The singing practice table (Table 17) says that nasal resonance — humming through the passaggio with the mouth closed — is good for practicing support because the exhale cannot leave through the mouth, and the section on nasal resonance sees the nasal sound as an extension of a conscious, slow exhale through humming, that is, support (Part 10, section 05).

05.Today's Practice

Turned into points to check while you practice, what the dissertation and the lesson highlight looks like this.

  1. Hum through the passaggio — With the mouth closed, hum through the passaggio. The dissertation writes that this is good for practicing support because the exhale cannot leave through the mouth (section 04; dissertation p.166).
  2. Closed and open glottis — While singing the same note, feel the difference in quality and resonance between a closed and an open glottis (section 03; dissertation p.158).
  3. Hold one note long — Lesson Ep. 7 (Support and Tone Control) covers support by holding one note long, and keeping the breath by lowering the diaphragm and bringing the vocal folds together (video description).

The lesson to watch with this part is Season 1, Episode 7, "Support and Tone Control." Its description lists holding one note long (support), tone control using resonance, the maxillary sinus, and keeping the breath by lowering the diaphragm and bringing the vocal folds together.

06.Where to Go Next

Posture and correct breathing are in Part 19 · Posture and Correct Breathing, and pitch and range practice kept by support continue in Part 21 · Pitch, Range and Interval Practice. The duet Kim Hyuk Gun sang with Park Ki-young can be heard in Kim Hyuk Gun and Park Ki-young's "The Prayer": Winning the 2017 New Year Special of Immortal Songs. Lesson videos are in Korean.

So the candle does not flicker — all the breath goes out as sound.

← Previous partKim Hyuk Gun's Research on Vocal Technique 19/24 · Posture and Correct Breathing: Every Sound Starts with PostureNext part →Kim Hyuk Gun's Research on Vocal Technique 21/24 · Pitch, Range and Interval Practice: One Table for the Practice Room

Frequently asked questions

What is "support" in singing?

Kim Hyuk Gun's doctoral dissertation explains support as a conscious, slow exhale — restrained exhalation — and concludes that "the exhale is the sound, and support is the technique of the exhale."

Is support holding your breath?

No. The dissertation explains support as the process of controlling the exhale by using the diaphragm tension created by a deep inhale and narrowing the glottis once more at the vocal folds. It is not blocking the breath but managing the exhale.

Why is support needed?

The dissertation writes that support training is needed to keep the sound steady without wasting breath and to move into the high range.

When can you start using support?

The dissertation explains that once you can keep good posture and breathing and your singing becomes skilled, you can at last consciously influence the exhale.

How do you practice support?

The dissertation's singing practice table presents nasal-resonance practice — humming through the passaggio with the mouth closed — as a good way to practice support, because the exhale cannot leave through the mouth.

Does the exhale change the tone too?

Yes. The dissertation explains that you can have many tones depending on how you adjust the exhale, and that the tone changes as the air resonates in the pharynx or nasal cavity or strikes the tongue, teeth and lips.

Sources

  1. RISS — 횡격막 마비군과 비마비군을 통한 복식호흡과 발성법 연구 (Ph.D. dissertation, Kyung Hee University)“날숨은 곧 소리이며 버팀은 날숨의 기술이다" ("The exhale is the sound, and support is the technique of the exhale.")” · 2019
  2. 뮤토리 (Mutory) — Cross Kim Hyuk Gun Vocal Lessons, How to Sing Well Ep. 7: Support and Tone Control“instructor Kim Hyuk Gun” · 2011.10.24

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