This eight-second, low-amplitude tone starts only when you press Play. Use a comfortable device volume. The player reaching the end does not prove the tone reached your speakers.
Stopped
Open Chrome's Site settings for this page, set Sound to Mute, return here and press Play. Then set Sound to Allow and try again. Automatic (default) inherits your current default.
This setting applies to the current website. On the public practice page, changing it also affects other HowCurio pages. Restore Sound to Automatic (default) when finished.
No microphone, recording, account, analytics or external resource is used. This is a synthetic tone, not a music or speech quality test.