Dog WhistleHow to Check Whistle Audio Output on Linux
On Linux, first stop playback and open your desktop's sound settings. Select the intended output and inspect any separate browser playback control. Then return to onlinedogwhistle.com for a brief tone at low system volume. Desktop controls differ, so follow the device names shown on your machine rather than expecting one universal menu.
Separate device selection from browser playback
Open the sound panel provided by your Linux desktop while the whistle is stopped. Look for the output device you plan to use. If the panel also lists individual applications or playback streams, inspect the browser entry there. Device selection and application volume are separate checks when both controls are present. Avoid changing several settings at once. Select an output, inspect its volume, and then check the browser entry. This makes it easier to identify which adjustment affected playback without installing extra audio tools.
- Read full device names when built-in audio, USB hardware, and display audio appear together.
- Check for muting at both the device level and the browser level.
Make a short, controlled playback check
Return to the page and lower system volume before starting. Place the speaker away from ears. Choose hold mode so releasing the control ends the tone. Start with steady playback and read the visible frequency. If discomfort occurs, end the sound at once. Do not increase volume simply because a high tone seems absent. The software gain begins at 10% and cannot exceed 25%, but system volume and connected hardware still affect actual output. Those percentages do not describe a measured sound level.
- Change one control between attempts so each check has a clear purpose.
- After using toggle mode, explicitly stop before opening another audio panel.
Understand the displayed range on this browser
The frequency control starts at 440 Hz and offers coarse changes of 100 Hz. Presets request 4,000, 8,000, 12,000, 16,000, and 18,000 Hz. The app limits these values using the actual AudioContext sample rate: multiply that rate by 0.45 and round down. On Linux, inspect the output device and any separate browser playback control in desktop sound settings. Check the current value after selecting it. Neither that number nor a successful browser start proves that your speaker reproduces the requested frequency. Many small speakers cannot produce ultrasonic output.
- Compare displayed values rather than assuming that every preset retains its requested number.
- Keep pulse and warble for later checks after establishing the intended output route.
Restart carefully after desktop or hardware changes
Stop the whistle before unplugging a device or selecting another output. Playback also stops on interruption, when the tab is hidden, and on a received devicechange signal. Browser support for that signal is incomplete; some route changes may go unreported. A desktop selection therefore still needs your own stop-and-check routine. When you return, inspect the output name and volume before starting again. Escape stops playback outside text fields, while Space toggles it. The 10 ms cosine fade shapes tone starts and stops; it does not confirm the route.
- Treat reconnection as another output check, even if the device name looks familiar.
- For offline use, first complete a successful cache while online, then check operation in your browser.
- With playback idle, locate the Linux desktop sound panel and read the available output names.
- Select your speaker, reduce its volume, and inspect any separate browser playback or mute setting.
- Open the whistle tab, choose hold and steady, then press briefly while checking the displayed value.
- Stop before reconnecting hardware, revisit the sound panel, and repeat a brief check only after reviewing volume.
Must I install another Linux audio utility?
Start with the controls already present in your desktop. Inspect the output selection and browser playback entry if available. This guide does not depend on a particular desktop, sound server, or extra package.
Can I use a clicker to measure the selected speaker?
Classic and soft clickers, plus the synthetic Quick yap marker, are playback choices. They are not measuring tools. Hearing one confirms only that you heard that sound during that attempt, not the speaker's full frequency range.
Will the app work without a network connection on Linux?
The PWA can work after its initial successful cache. Offline operation is not promised across every browser. The app includes 20 searchable, shareable text lessons, but it has no accounts or uploads. Hosting metadata still exists.