The Key & Scale menu lets you define the Key and Scale settings of the track you plan to process.

Scales are specific sequences of notes arranged in ascending or descending order, based on a pattern of whole and half steps. The key of a song defines its tonal center and a set of relationships between notes and chords. These concepts work together to create a sense of tonality and musical mood.

In the context of AutoTune, the Key and Scale parameters work together to define the pitch targets that the AutoTune algorithm tunes notes to.

The more common scales, Chromatic, Major, and Minor, are listed at the top of the Scales section:

Chromatic - Contains all twelve notes of the chromatic scale. Use when you want AutoTune to correct to the nearest semitone regardless of key. Chromatic is ideal for atonal music or when you're unsure of the key.
Major - The standard major scale with its characteristic bright, happy sound. The most common scale in Western pop, rock, and country music.
Minor - The natural minor scale with its darker, more melancholic character. Foundational to countless songs across all genres from classical to contemporary.

For more scale options, click the Additional Scales button, which contains the following:

Harmonic Minor - Minor scale with a raised seventh degree, creating additional tension and a classical or exotic quality. Common in classical music, metal, and neoclassical styles.
Melodic Minor (Jazz) - Minor scale with raised sixth and seventh degrees, offering a sophisticated, jazz-oriented tonality. Widely used in jazz improvisation and fusion.
Blues (Minor) - Modified minor pentatonic scale adding the diminished fifth (blue note), giving it the classic blues sound with expressive, soulful possibilities. Essential for blues, rock, and R&B.
Pentatonic (Major) - Five-note subset of the major scale omitting the fourth and seventh degrees. Creates a safe, consonant sound perfect for rock, country, and pop melodies.
Pentatonic (Minor) - Five-note subset of the natural minor scale, avoiding dissonant intervals. The go-to scale for rock, blues, and folk guitar solos with its universally pleasing sound.
Diminished - Symmetrical scale built from alternating half and whole steps, creating an ambiguous, tense quality. Used in jazz for chromatic movement and tension over diminished chords.
Whole Tone - Scale constructed entirely from whole steps, producing a dreamy, floating quality with no clear tonal center. Associated with impressionist composers like Debussy and modern film scores.
Dorian - Minor mode with raised sixth degree, giving it a brighter sound than natural minor. Common in jazz, funk, and rock.
Phrygian - Minor mode with characteristic lowered second degree, creating an exotic, Spanish or Middle Eastern flavor. Often used in flamenco and metal.
Lydian - Major mode with raised fourth degree, producing a dreamy, ethereal quality. Popular in film scores and progressive rock for its floating, mysterious sound.
Mixolydian - Major mode with lowered seventh degree, resulting in a bluesy, rock-oriented tonality. Frequently heard in classic rock, blues, and folk music.
Locrian - Diminished mode with lowered second and fifth degrees, creating an unstable, dissonant quality. Rarely used for entire compositions but effective for tension in jazz and experimental music.