How to stop straining your voice
Vocal strain is measurable before it is audible — what jitter, shimmer and harmonics-to-noise ratio reveal about how a take is costing you.
What it sounds like
The voice sounds pressed, breathy or rough, and it tires quickly. Often the recording sounds fine on the first listen and the throat feels it an hour later.
What is actually being measured
Three acoustic perturbation measures taken from the isolated vocal: jitter (cycle-to-cycle variation in pitch period), shimmer (cycle-to-cycle variation in amplitude), and harmonics-to-noise ratio, which is how much of the sound is periodic voice versus turbulent noise.
A strain problem opens when local jitter exceeds 1.5% or harmonics-to-noise ratio falls below 15 dB, and counts as severe at 5% jitter or 5 dB HNR.
Why it happens
Strain is what happens when the vocal folds are being driven by pressure rather than balanced by it. Singing above your comfortable range, pushing for volume, singing over a loud room, and singing while unwell all produce it. So does dehydration, which is much more common than any of them.
How to fix it
- Stop and rest, first. Strain measurements are the one part of a report that describes damage rather than performance.
- Move the song down a key. Persistent strain on the top of a range is usually a repertoire problem, not a technique problem.
- Trade pressure for resonance: aim for the note to feel forward and buzzy rather than loud from the throat.
- Warm up properly and hydrate. Both move these numbers measurably within a single session.
The drill
Gentle sustained tones in the comfortable middle of the range at low volume, with the pass criterion set on tone quality rather than on pitch — the drill is asking for an unpressed sound, and rewards backing off.
Run a 30-second quick check
Sing into your microphone for 30 seconds and get measured scores for pitch accuracy, vocal strain and dynamics. Free once a month, no account and no file to upload.
Run a 30-second quick checkCommon questions
Can a recording detect vocal damage?
No. Jitter, shimmer and HNR are acoustic measurements of how periodic and how noisy the voice signal is, and they are used clinically as screening indicators — but a score is not a diagnosis. Persistent hoarseness, pain, or loss of range are reasons to see an ENT specialist or a speech-language pathologist, not reasons to run another analysis.
Why does my strain score change between recordings of the same song?
Because it measures the state of your voice on the day, not your technique in general. Time of day, hydration, sleep, a cold, and how much you have already sung all move these numbers. That is what makes it useful to track.