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Tuning by microphone, explained.

How the tuner hears a note through your microphone, what cents mean, and why one string at a time works best, with nothing recorded or sent.

By 2 min read

The Tuner: E2 with the needle a little flat and the word tighten

A tuner listens for the repeat in a string's sound.

Finding the pitch.

The sound is read a few thousand samples at a time and its pitch found by the McLeod pitch method (pitchy), trusted only when it is clear and loud enough.

Cents.

A cent is a hundredth of a semitone; within 5 cents the page says In tune.

Nothing kept.

The microphone is asked for only when you press Start; nothing is recorded or sent.

Further reading

Topics: tuner · online tuner · guitar tuner · cents · pitch detection

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