Auto-Tune and Melodyne: correction and creative use

What it is and how it works

• Auto-Tune (Antares, developed by Andy Hildebrand and released in 1997) detects the pitch of a monophonic voice in real time and moves it toward the nearest note of the chosen scale. With slow correction times it is invisible; with zero time it removes the natural transitions between notes and produces the robotic effect made famous by Cher in "Believe" (1998) and later by T-Pain, and now standard in trap, pop, afrobeats, reggaeton.
• Melodyne (Celemony) analyzes recorded audio and displays it as note "blobs": you can correct, move, time, and change the vibrato, formants and volume of each note by hand. With DNA (Direct Note Access) technology it also works on polyphonic material. It is the tool of transparent correction and precision editing.

Rule: Auto-Tune for quick correction, tracking and effect; Melodyne (or graphical editors like Newtone) for invisible correction of exposed vocals and for creative editing.

Auto-Tune parameters (and those of real-time correctors)

• Key and Scale: key and scale of the song (or only the notes used in the melody). The most important parameter: with the wrong scale the voice "jumps" to wrong notes. If the song modulates, automate the scale.
• Input type: soprano, alto/tenor, low male voice, instrument, bass: improves detection.
• Retune Speed: the time it takes for the note to be brought to pitch. 0 ms = hard tune (effect); 1–10 ms = very tight (modern pop, melodic trap); 15–25 ms = noticeable but natural correction; 30–50+ ms = transparent, leaves vibrato and portamentos.
• Humanize: slows the correction on long notes to leave them natural even with fast retune.
• Flex-Tune: corrects only when the voice is already close to the note (leaves expressive passages alone).
• Natural Vibrato: increases or reduces the original vibrato.
• Formant / Throat: formant correction and "throat length" (changes character).
• Transpose / Detune / Reference (A = 440 Hz): for songs tuned differently (e.g. 432, 442 or samples not at 440).
• Tracking: detection sensitivity (more relaxed on voices with noise or breath).
• Low latency: mode for recording with the effect in the headphones.
• Graph mode: correction drawn note by note (similar to Melodyne).

Tools in FL Studio

• Pitcher: real-time correction with key/scale, correction speed, formants/gender and MIDI-driven harmonization.
• Newtone: graphical pitch and time editor (cutting notes, centering pitch, reducing variation/vibrato, timing correction): the stock equivalent of Melodyne.
• Pitch Shifter (Absolute mode): flattens the notes to a melody driven by automation or keyboard (creative robotic effect).
• Third-party: Antares Auto-Tune (Pro, Artist, Access, EFX+, Hybrid), Celemony Melodyne (essential, assistant, editor, studio), Waves Tune Real-Time and Waves Tune, Synchro Arts RePitch, Auburn Graillon and MAutoPitch (free). Melodyne in FL is used as a plugin (with the transfer function) or through ARA integration in the versions that support it: check in your version of FL.

Workflow: transparent correction (Melodyne/Newtone)

1. Comp and edit the vocal before correcting.
2. Analyze; check that the notes are recognized correctly (split merged notes, join fragments).
3. Pitch center (centers the average pitch of each note): 40–80%, not 100% on everything. Correct only the notes that are really out of tune.
4. Pitch drift/variation (internal drift): 0–30%; leave vibrato and portamentos.
5. Check the transitions between notes (unnatural portamentos) and the sibilants (don't correct them).
6. Formants: don't touch them except for large shifts.
7. Timing: align the initial and final consonants of doubles and choirs with the lead (don't quantize everything).
8. Listen in context: a "flat" note can be expressive.

Workflow: hard tune effect (Auto-Tune)

1. Set the correct key and scale (or only the notes of the melody for a "cleaner" effect).
2. Retune Speed 0–5 ms, Humanize 0–20, Flex-Tune 0.
3. Insert Auto-Tune as the first plugin in the chain (before compression and saturation), so detection works on a clean signal.
4. Record with the effect in the headphones (low latency) so the singer can adapt.
5. Out-of-scale notes become "jumps": sometimes they are the signature of the style.
6. Doubles and ad-libs with the same setting; harmonies with Pitcher, Harmony Engine or Melodyne.

Starting settings by genre

Creative use

• Hard tune with a deliberately narrow scale (pentatonic) for "stepped" melodies.
• Melodyne for creating harmonies: duplicate the voice, move the notes by thirds/sixths, slightly change formants and timing for realism.
• Rewriting melodies and vocal chops: move the notes and the timing for new hooks from a single recording.
• Flattening the vibrato for a modern "synthetic" sound.
• Formants for "smaller" or "bigger" voices.
• Correcting monophonic (bass, winds, violin) or polyphonic (Melodyne DNA) instruments.

Common mistakes

• Wrong key or scale: notes jumping to wrong scale degrees.
• Fast retune on voices with wide, slow vibrato without Humanize: unwanted "stair-step" effect.
• 100% correction of pitch and drift in Melodyne: a flat, artificial voice.
• Auto-Tune after saturation, reverb or delay: unstable detection.
• Correcting sibilants and breaths: artifacts.
• Songs not tuned to 440 Hz (samples) without adjusting the reference.

How to hear it

• Listen to the transitions between notes: with transparent correction they must remain natural portamentos; with hard tune the jump must be sharp and clean.
• Check with a tuner or with the Newtone/Melodyne view: long notes centered within ±10–15 cents in natural correction.