How to use a chromatic tuner

A chromatic tuner listens to a note and shows how close it is to a reference pitch. Play one note, check that the tuner names the note you intend, then adjust until the cents reading settles near zero. The note name matters as much as the needle: a perfectly centered F is still the wrong pitch if you meant to tune an E.

Read the note before the needle

Start somewhere quiet and let one note ring. Mute other strings so the microphone hears a clear pitch. A chromatic tuner recognizes all twelve notes; you choose which note you are aiming for.

For a guitar in standard tuning, the open strings from thickest to thinnest are E2, A2, D3, G3, B3 and E4. On a four-string bass they are E1, A1, D2 and G2. Check your instrument’s intended tuning before turning a peg. If the displayed note is far from your target, make small adjustments and keep checking it.

The octave number distinguishes pitches with the same letter. E2 and E4 have the same note name, but they are two octaves apart. A tuner that shows frequency gives you another way to tell them apart.

What sharp, flat and cents mean

A negative cents reading means the note is below the reference, or flat. A positive reading means it is above the reference, or sharp. Zero means it matches. There are 100 cents in an equal-tempered semitone, the distance from E to F or from C to C#.

On a string instrument, tighten the string slightly to raise its pitch and loosen it to lower the pitch. Which direction your hand turns depends on the instrument and how the string is wound. Move a little, play the note again, and watch what happens.

A plucked note can begin slightly sharp and drift as it decays. Use a comfortable playing strength, allow the initial attack to pass, and read the stable part. Trying to chase every flicker makes tuning harder.

Set the reference pitch

A4 at 440 Hz is a common reference. If you play with a piano or an ensemble using a different reference, match theirs. Changing the reference shifts the targets for every note; it does not change the names of the notes.

In Gelato Tuner, the A4 setting runs from 430 to 450 Hz, and the reference tone follows it. Leave it at 440 Hz unless you have a reason to change it. Sharps and flats are alternate labels for some pitches: C# and Db refer to the same piano key in equal temperament.

A short tuning routine

1. Check the intended note and octave for each string.
2. Play one open string and mute the others.
3. Adjust in small steps, listening and checking the stable reading.
4. Move through the remaining strings.
5. Check every string once more, then play a familiar chord.

The second pass catches small shifts caused by changing the tension of other strings. If open strings read correctly but fretted chords still sound wrong, the instrument may need an intonation or setup adjustment. More tuning-peg turns will not fix every problem.

For wind instruments and voice, hold a comfortable note and observe its center. You can also sustain a reference tone and listen for the pulsing that happens when two nearby pitches sound together. Try an A4 reference at a moderate volume before moving to other notes.

Gelato Tuner uses the microphone only while its Tuner tab is visible. It shows the note, cents and frequency, with a green display and a soft haptic tap when you reach the target. Once tuned, practice with a metronome or try a progression in the chord player.