How OOVO Works: The Science of Straw Singing

How OOVO Works: The Science of Straw Singing

A vocal straw is the most studied warm-up tool in modern voice science. OOVO turns it into something you'll actually wear, carry, and use every day.

What is straw singing?

Straw singing (also called straw phonation, vocal straw exercises, or SOVT training) is the practice of vocalizing through a narrow tube to partially block, or semi-occlude, your vocal tract. The technique sits at the center of a body of research known as Semi-Occluded Vocal Tract (SOVT) exercise, popularized in modern vocal pedagogy by researcher Dr. Ingo Titze at the National Center for Voice and Speech, and developed in clinical and studio practice by voice specialists including Jeanie LoVetri.

When the straw's diameter is calibrated correctly, the back-pressure it creates balances the air pressure above and below your vocal folds. The folds vibrate more efficiently, with less collision force. The result is a low-impact form of resistance training for the voice: the vocal equivalent of swimming laps instead of sprinting on concrete.

How OOVO works

Every OOVO product trains three elements of the voice at once: breath, phonation, and resonance. You exhale steadily through the straw while phonating: sliding through scales, sustaining pitches, or speaking on a tone. The constriction at your lips does the work that effort and tension would otherwise demand from your throat.

In practice, you feel the load shift. Your vocal folds release. Your breath finds a more efficient path. Your tone settles into focus.

“It's like hitting a reset button for your voice.” — Laura Donohue, Nashville vocal coach

What it does for your voice

OOVO is built on voice science, not vocal fads. Researchers, performance coaches, and clinicians have shown that consistent SOVT practice can help singers and speakers:

• Expand vocal range without forcing
• Use breath more efficiently
• Ease vocal strain and recover from heavy use
• Smooth out vocal breaks between registers
• Warm up safely before performance
• Practice quietly without straining
• Build power through low-impact reps
• Support voice rest and rehabilitation

Benefits are immediate and compound with daily practice.

How to use it

It's deceptively simple: sing or speak through it. Five-minute sessions, up to five times a day, are enough to feel a difference. New to SOVT? Start with our free vocal straw exercises and follow along.

OOVO Straw Necklace vs. Sing Ring: which tool is for you?

Both deliver real SOVT training. They're built for different singers.

OOVO Vocal Straw Necklace: for the working voice

Designed in Santa Monica and individually hand-crafted by jewelers in sterling silver, 18k gold vermeil, and 18k rose gold vermeil, the OOVO Straw Necklace is precision-engineered to deliver a consistent 3mm resistance. That's the diameter most often referenced in vocal-science literature for straw phonation.

• One calibrated resistance, every time
• Hypoallergenic sterling silver, 18k gold vermeil, or 18k rose gold vermeil throughout
• 30-inch chain, hands-free and ready when you are
• Wearable on stage and street: fine jewelry that's also a working tool
• Quieter practice than a plastic straw, so you can warm up backstage, on a plane, or in a hotel room
• Includes the OOVO Care Kit: cruelty-free microsuede pouch, polishing cloth, and cleaning brush

Best for: touring and recording vocalists, voice teachers, clinicians, and anyone who wants the same calibrated resistance the research recommends, every session, for years.

Shop the Vocal Straw Necklace in Sterling Silver ($119) · 18k Gold ($159) · 18k Rose Gold ($159)

Sing Ring by OOVO: four resistances, one device

The Sing Ring ($49) is a solid antimicrobial brass handheld tool with four resistance levels in a single device, including one level (2.5mm) stronger than the Necklace's 3mm. Made from C26000 cartridge brass (the same alloy family used in professional wind instruments), the Sing Ring develops a natural patina with daily use and polishes back to bright with the included Care Kit.

• Four resistances to find your personal sweet spot
• Solid antimicrobial brass, the same material family used in professional wind instruments: heavier, durable, affordable
• Sound-dampening for quiet practice
• Pocket-sized with an included carry case
• Patinas with use like a fine instrument; polish back to bright at any time

Best for: students, beginners, voice users who like to vary their resistance, or anyone who wants to discover their preferred level before investing in the Necklace.

Try the Sing Ring

Who uses OOVO

OOVO is used by people whose voices carry their work.

• Grammy-winning and Broadway vocalists, including mezzo-soprano Isabel Leonard, Pentatonix's Scott Hoying, and Broadway actor Jim Hogan
• Vocal coaches and voice teachers including Laura Donohue (Nashville), John Henny (John Henny Music Academy), and Sara Leib (Voxercise CEO)
• Speech-Language Pathologists and voice clinicians, including Kristie Knickerbocker, who uses OOVO with patients in voice therapy
• Opera and classical singers including Justin Fatu Su'esu'e
• Public speakers, teachers, executives, and clergy whose livelihoods depend on a reliable voice

“I can't recommend it enough. It's my favorite warm-up device I've ever used.” — Jim Hogan, Broadway actor

Read more reviews from professionals.

One tool, not a drawer of disposables

The straw-singing technique used to require a drawer full of plastic coffee straws. OOVO replaces that with one beautifully made tool you'll keep for life. It's not why we built OOVO. It's a benefit of building it well.

Frequently asked questions

What is SOVT (Semi-Occluded Vocal Tract) exercise?

SOVT exercise is any technique that partially blocks the vocal tract during phonation, including straw singing, lip trills, and humming. The partial blockage balances air pressure across the vocal folds, allowing them to vibrate with less impact. Dr. Ingo Titze's research at the National Center for Voice and Speech is widely cited as the foundation of modern SOVT pedagogy.

Why a 3mm straw?

A 3mm interior diameter sits in the resistance range most often referenced in SOVT literature for general vocal training: narrow enough to create meaningful back-pressure, wide enough to sustain breath through a phrase. The OOVO Straw Necklace is precision-machined to that spec for consistent results across every session.

How often should I use a vocal straw?

Up to five minutes per session, up to five times per day. Many singers use OOVO as part of a daily warm-up; others reach for it after long rehearsals, sessions, or speaking days to help the voice recover.

Will straw singing fix vocal strain?

SOVT exercise is widely used by voice teachers and clinicians to ease vocal effort and support recovery from heavy use. It is a training and conditioning tool, not a medical device. If you have persistent hoarseness, pain, or vocal injury, consult a laryngologist or licensed Speech-Language Pathologist. OOVO is not a medical device and is not intended to diagnose, treat, cure, or prevent any condition.

Can beginners use OOVO?

Yes. Many users start with the Sing Ring to explore four resistance levels, then move to the Necklace once they know their preferred resistance. Free guided vocal straw exercises are available on our site.

How is OOVO different from a plastic coffee straw?

A coffee straw works once. OOVO is precision-calibrated, hypoallergenic, designed to be worn or carried, and built to last a lifetime.

Use OOVO safely

OOVO products are vocal training tools designed for healthy adults. They are not medical devices, have not been evaluated by the FDA, and are not intended to diagnose, treat, cure, or prevent any disease or vocal pathology.

The device only reflects the pressure you put through it. The Sing Ring and OOVO Straw provide back pressure only in response to the air you push through them — the devices themselves generate no force. SOVT exercises work best with light, sustained airflow. If you have to push hard, you’re pushing too hard. Less is more.

Stop and rest immediately if you experience: lightheadedness, dizziness, headache, chest discomfort, shortness of breath, ringing in the ears, blurred vision, or any vocal pain, hoarseness, or strain. Resume only when symptoms have fully resolved — and ease off the intensity.

Consult a healthcare professional before use if you have: a heart condition, high blood pressure, lung condition (including asthma or COPD), recent vocal, chest, or abdominal surgery, untreated vocal nodules, polyps, or other vocal-fold pathology, or if you are pregnant. Adult use only; keep necklaces and pendants away from children under 14 due to choking hazard.

Antimicrobial note. References to antimicrobial brass describe a natural property of the copper-rich alloy itself. OOVO products are not registered antimicrobial or medical devices, and we make no human-health antimicrobial claims. Read our full Safety & Use guidelines.

Find your best voice

Shop the Vocal Straw Necklace · Try the Sing Ring · See free exercises

Vocal science sources

OOVO products are designed around the published body of research on Semi-Occluded Vocal Tract (SOVT) exercise, including work by Dr. Ingo Titze and colleagues at the National Center for Voice and Speech (e.g., Titze, I. R. (2006). Voice training and therapy with a semi-occluded vocal tract: Rationale and scientific underpinnings. Journal of Speech, Language, and Hearing Research), and the applied vocal pedagogy of practitioners including Jeanie LoVetri (Somatic Voicework). OOVO is a vocal training tool and is not a medical device.