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Voice & Playback Safety

This is the public, versioned copy provided with Vocal Light.

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Vocal Light Voice and Playback Safety Notice

Effective date: July 17, 2026 Last updated: July 19, 2026 Version: voice-safety-2026-07-19-v13

Stop before discomfort becomes injury

Use Vocal Light only for comfortable singing practice. Never force your highest or lowest possible note, sing through pain, or continue because the App displays a target.

Do not practice while hoarse, ill, unusually tired, strained, dizzy, short of breath, or in pain.

Stop immediately if you experience pain, burning, strain, loss of voice, hearing discomfort, ringing in the ears, dizziness, shortness of breath, faintness, or another unusual symptom. Seek appropriate qualified professional advice for persistent or concerning symptoms. Use emergency services when immediate help is needed.

Comfortable range and automatic piano register

  • Moving the voice-category slider applies and saves that approximate range immediately. The saved range also moves generated piano notes and chord voicings into a corresponding register.
  • The range analyzer asks for one comfortable low and one comfortable high. These are easy, repeatable practice notes—not your absolute lowest or highest possible notes.
  • The analyzer cannot feel pain, effort, fatigue, strain, illness, or discomfort. A repeated-note confirmation is only a software detection and is not proof that a note or range is safe.
  • Review both displayed note names before saving. Start over or enter the notes manually if a note looks wrong, appears in the wrong octave, felt effortful, or required you to push.
  • Never keep singing or repeat a note merely to satisfy an App prompt. Stop first whenever your own sensation conflicts with the display.

Audio playback

Start with the device media volume at its lowest practical setting. Increase slowly only if necessary.

  • iPhone is the App’s read-only display of Apple’s user-controlled shared device media volume, which may affect other apps. Vocal Light does not set or lower it for you. Vocal Light is designed to stop its own generated references when iOS reports that this setting exceeds 50 percent, but that App-local cutoff may fail or be delayed and does not make another app quieter.
  • Vocal Light Volume attenuates only Vocal Light’s generated references from silence to the App’s bounded maximum. It cannot make another app quieter and cannot add gain above Vocal Light’s maximum.
  • A percentage or slider position is not a sound-pressure measurement and is not proof of a safe listening level.
  • Serial compression, parallel compression, and limiting can make sound seem louder without raising its final peak. Headphones can cause hearing injury even when the App’s limiter or route logic is working.

On supported iPhones, you can separately turn on Apple’s Reduce Loud Audio and select 85 dB in Settings > Sounds & Haptics > Headphone Safety. That is a user-controlled iOS feature. Vocal Light cannot enable, verify, or guarantee it, and Apple states that headphone-level estimates are most accurate with compatible Apple or Beats headphones.

The current build is intended to allow generated references on the built-in speaker and detected wired or Bluetooth personal-audio routes, using route-specific bounded output profiles, and to block detected AirPlay, car, USB, line-out, mixed, unknown, and other amplified routes. Detection can fail or be delayed. When the route changes, Vocal Light is designed to stop its own sound and require a new playback tap. When iOS reports that the App is becoming inactive, Vocal Light closes an App-local render gate, mutes its mixer and supported audio session, stops its engine, and deactivates its session. Those safeguards can fail or be delayed and cannot guarantee that another app, a headphone, a speaker, a car system, or other equipment will be quiet.

Before playback, after a route change, and before switching apps, independently check and lower the actual device and equipment volume. Do not rely on Vocal Light as hearing protection.

Practice aid—not medical care

Vocal Light provides estimated practice feedback. It does not diagnose, assess, monitor, treat, rehabilitate, or prevent a voice or hearing condition and does not determine what is safe for you.

Never use Vocal Light while driving, operating machinery, crossing traffic, or doing anything that requires undivided attention.

The Terms of Use and Liability Waiver contain additional safety obligations and risk disclosures.