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Sound DesignVocalsPitch

Formant Shift A Vocal Without Changing The Pitch

Pitch is the note, formant is the size of the voice singing it. Moving them separately gives bigger, smaller or doubled vocals with the melody untouched.

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By Nolvra

The Note And The Voice Are Two Different Things

Pitch a vocal up a few semitones and it does two things at once. The melody moves, which is what you asked for, and the singer seems to shrink, which you did not. That second change is the formant: the set of resonances the throat, mouth and nose put on every sound, which is how you tell a large voice from a small one singing the same note. A plain pitch shifter moves both together. Separating them is what lets you keep a melody and change the voice, or keep the voice and change the melody.

What A Formant Actually Is

Every voice has a few frequency regions that ring louder than the rest, set by the size and shape of the vocal tract. They stay roughly where they are whatever note is sung, which is why you can recognise a friend singing high or low. When a recording is sped up or pitched the naive way those regions move with the note, and a body sized voice turns into a cartoon.

Move the formant down on its own and the same melody sounds sung by a larger, darker voice. Move it up and the voice gets smaller and brighter. Move the pitch and pull the formant back by the same amount and the melody changes while the singer still sounds like the singer. That last one is the move behind most natural sounding vocal pitching, and the guide to pitching a vocal loop into your key relies on it.

Four Uses Worth Learning

Make A Voice Bigger Or Smaller Without Touching The Melody

Leave the pitch at zero and move only the formant. One or two semitones is already a clearly different voice; past four it starts to sound processed. Darker for weight under a hook, brighter to push an ad lib away from the lead.

Pitch A Vocal And Keep The Singer

Move the pitch to the new key, then set the formant to the opposite amount, or use formant preservation if the tool offers it. Listen on the vowels. If they sound hollow, ease the correction back a little; the exact number depends on the voice.

Build A Double That Does Not Phase

Duplicate the lead, shift the copy's formant a small amount up or down with the pitch unchanged, and pan the two apart. The copy reads as a second singer rather than the same take delayed, and it holds together better in mono than a detuned double does.

Link Them On Purpose For The Classic Effect

Sometimes the cartoon is the point. Link pitch and formant and push them together for the chipmunk sound or the giant, and treat it as a sound design layer rather than a correction.

Where PITCHMELT Fits

PITCHMELT keeps the two moves on one panel. PITCH moves the melody up or down by up to 12 semitones, FORMANT shapes the size of the voice on its own over the same range, and the two can be linked for the classic chipmunk and giant. Shift mode keeps every bend, slide and vibrato moving with the voice; Robotic sings every word on one note you choose.

Drive, high pass, low pass, a widener, mix and output sit on the same panel, so the shaped voice can be finished where it was made. Low Latency brings the delay to about 2 ms for monitoring while recording, and the normal mode reports its latency to the DAW for the cleanest result. If the source is a sample rather than your own take, clean it before you pitch it, because every artifact moves with the formant too.

Formant Moves That Usually Go Wrong

  • Large formant shifts on a lead vocal. The audience notices the voice before the melody.
  • Formant and pitch moved in the same direction when you only wanted a new key. That is the chipmunk.
  • A formant shifted double panned dead centre. It sums into a thin, phasey lead.
  • Judging the shift soloed. A formant change that is obvious alone often disappears in the beat.
  • Shifting a reverb soaked sample. The room changes size along with the voice.

Move The Notes, Shape The Voice

PITCHMELT moves pitch and formant up to 12 semitones either way, on their own or linked, with a natural Shift mode and a Robotic mode on one panel.

See PITCHMELT

FAQ

What is the difference between pitch shifting and formant shifting?

Pitch shifting changes the note being sung. Formant shifting changes the resonances that tell you how large the voice is. A basic pitch shifter moves both together, which is why pitched vocals sound smaller or larger.

How do I formant shift a vocal without changing the pitch?

Use a plugin with separate pitch and formant controls, leave the pitch at zero and move only the formant. One or two semitones is a clear change; larger amounts start to sound like an effect.

Can formant shifting make a vocal sound like a different singer?

It changes the apparent size of the voice, which goes a long way, and a small formant offset on a double is often enough to make it read as a second singer.

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