Many singers struggle with volume. When you try to sing louder, does your throat feel like it's closing up? Do you feel a scratching sensation or an urge to cough? This is a sign that you are increasing volume by squeezing the vocal cords together (medial compression) rather than by increasing the airflow (subglottal pressure).
The solution isn't to "push harder" from the throat. It is to regulate the air pressure from your abdominal muscles while keeping the throat completely open.
Actionable Step: The 'Zzz' Crescendo
This exercise uses a voiced fricative ("Zzz") to train this coordination. Because the "Z" sound creates a bottleneck at the teeth, it creates back-pressure (inertance) that helps keep the vocal folds vibrating safely, even as you increase the power.
1. The Sound
Make a buzzing "Zzz" sound, exactly like a bee. It should be buzzy and consistent.
2. The Feel
Feel a strong vibration on your front teeth and lips. If you feel the vibration moving back into your throat, you are squeezing. Keep it forward!
3. The Drill
Start the note at a low volume (piano). Over the count of 8, gradually increase the pressure from your stomach to swell the sound to a loud volume (forte).
Practice with Vocal Driller
Why This Works
The "Zzz" is a Voiced Fricative. By narrowing the exit for the air at the teeth, this creates a state of high semi-occluded vocal tract (SOVT) pressure.
This back-pressure acts as an air cushion for the vocal folds. When you swell the volume (Crescendo), you are essentially training your expiratory muscles (the abdominals and intercostals) to drive the sound, while the back-pressure prevents your throat muscles from grabbing or constricting to "help." It isolates the power source (air) from the vibrator (cords).