Some orchestras tune to 442 Hz; change the frequency to match.

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Play the A4 tuning note at 440 Hz.

Good to know: Some orchestras tune to 442 Hz; change the frequency to match.
Does anything leave my device?: No. Every sound is made in your browser, and your settings stay on your device.
Does it work offline?: Yes. Once this page has loaded, it keeps working without an internet connection.

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