Vocal Parameters

Shape an AI singer's performance in ACE Studio with the Breath & Phoneme, Dynamic, and Advanced vocal parameters.

This page describes the vocal parameters for vocal synth models of Verse 2.6 and later (V2 models). If you are using Verse24 or earlier, please refer to Vocal Parameters for V1 Models. To learn more about the differences between model versions, please refer to Vocal Synth Models.

Overview

The AI parameters panel sits at the bottom of the Clip Editor. It is where you shape how the AI singer performs your notes and lyrics. For V2 models, the panel has three tabs:

• Breath & Phoneme – add breaths and adjust the timing of every phoneme.

• Dynamic – control the intensity of the vocal delivery with a single envelope.

• Advanced – fine-tune the underlying vocal parameters Air, Falsetto, Tension, and Energy.

If the current AI singer supports special controls such as Rap or Opera, they appear as extra tabs next to Dynamic.

Breath & Phoneme

Just like human singers, taking a breath before a phrase makes a vocal performance sound more natural, and the length of each consonant and vowel shapes its articulation. The Breath & Phoneme tab lets you control both.

The lane shows a breath block (labeled BR.) wherever a breath has been added, and splits every note into its phonemes, so you can see and adjust exactly how long each sound lasts.

Adding Breath

Automatic Addition

Click the Add all button on the left of the lane to add breaths to the entire clip. ACE Studio intelligently places them at appropriate positions, such as the beginning of each phrase.

Manual Addition

Click the empty area before a phrase to add a breath there.

Adjusting Breath Duration

Drag the left edge of a breath block to make the breath longer or shorter.

Adjusting Phoneme Duration

The duration of each phoneme is generated by AI based on the accent and singing style of the current AI voice. To change it, drag the boundary between two phonemes. Moving a boundary lengthens one phoneme and shortens its neighbor, so the note itself keeps its length.

This works for both consonants and vowels. A longer consonant gives the syllable a stronger, more deliberate attack; a shorter one makes the transition between notes smoother.

• The boundary at the start of a note is fixed in this lane. To change where a note begins, move or resize the note itself in the piano roll. See Editing Notes.

• Phonemes you have adjusted turn blue. Their durations are locked and will not be regenerated by the AI when you change the notes, lyrics, or AI voice, just like a section locked with the fixed brush.

• Keep adjustments within a natural range. If a phoneme is stretched or squeezed to an extreme, the model may not follow the new duration precisely.

Phoneme durations are about timing. To change which phonemes a note sings, edit the phonemes on the note itself. See Edit Phonemes.

Dynamic

What Is Dynamic

Dynamic is a single envelope that controls the overall intensity of the vocal delivery, from soft and gentle to powerful and full. Push the curve higher for more power and impact, ideal for choruses and dramatic moments. Pull it lower for a softer, more delicate tone, suited to verses, ballads, and intimate passages.

Dynamic replaces the separate Power, Soft, Breathy, and Chest controls of earlier versions. Instead of balancing four parameters that each had a subtle effect, you shape the performance with one intuitive curve, and ACE Studio translates it into the right combination of vocal qualities.

If you open a project that already contains edits to Power, Soft, Breathy, or Chest, the panel keeps showing those four lanes in place of Dynamic so your existing work is preserved. See Legacy Vocal Controls below. New projects show Dynamic only.

Auto and Manual

When no envelope is drawn, Dynamic is in Auto mode: the AI infers the dynamics from the melody, lyrics, and the singing style of the current AI voice. Wherever you draw, that region switches to Manual and follows your curve. The labels along the bottom of the lane show which parts are Auto and which are Manual. The dotted line through the middle of the lane marks the neutral level.

Editing the Envelope

Two tools are available on the left of the lane:

• Brush (default) – left-click and drag to draw the envelope freely. Right-click and drag to erase; the erased region returns to Auto.

• Line tool – drag to draw a straight line, useful for clean crescendos and decrescendos.

Special Controls

Some AI singers come with a special control that adds a distinctive singing style on top of Dynamic. When the current singer supports one, it appears as an extra tab next to Dynamic. To edit a special control, left-click and drag to draw the envelope, and right-click and drag to erase it.

Rap

"Rap" controls the rap style of the voice. Increasing this parameter enhances the clarity, speed, and rhythm of the articulation, making the voice more aggressive and street-like. It is suitable for rap sections in hip-hop music, pop songs, or any passages requiring strong rhythmic expression.

Opera

"Opera" injects classical bel canto singing techniques into the voice. Increasing this parameter enhances the resonance and penetration of the voice, adds brilliant vibrato and dramatic tone, making the voice sound more bright and full. It is ideal for singing classical arias, brilliant segments in musicals, or adding a grand, epic feeling to songs.

Chinese Opera

"Chinese Opera" adds the unique charm and singing style of traditional Chinese opera to the voice. Increasing this parameter makes the articulation more distinctive, the tone brighter and higher-pitched, and incorporates the common melismatic and ornamental sounds of Chinese opera. It is suitable for singing opera excerpts or integrating "Chinese style" elements into modern music.

Advanced

Click Advanced to expand four additional parameters: Air, Falsetto, Tension, and Energy. Click the arrow again to collapse them.

Unlike Dynamic, these are not envelopes. They are the real parameters of the synthesis: the actual values, from 0 to 1, that the AI generates and feeds into the voice. Just like AI pitch, they are generated from the singing style of the current AI voice, the melody, the lyrics, and the pitch. Whenever any of these elements change, the AI regenerates the parameters for the affected section, piece by piece; even a single changed lyric regenerates every parameter in that piece.

Any part you edit manually becomes a user parameter. User parameters are kept as they are and will not be regenerated when you change the notes, lyrics, or pitch.

For most songs, Dynamic is all you need. Use the Advanced parameters when you want precise control over a specific vocal quality, and keep the adjustments moderate: extreme values may result in unexpected performance.

Parameters

Air

Controls the airiness of the vocal. Increasing it makes the voice raspier and brighter.

• A slight increase works well on powerful passages.

• Keep changes small; extreme values may result in unexpected performance.

Falsetto

Controls the amount of falsetto in the vocal.

• On low notes, increasing Falsetto may not bring as much falsetto as expected.

• For more falsetto, lower Tension at the same time for a better result.

• Keep changes small; extreme values may result in unexpected performance.

Tension

Controls how tight or relaxed the vocal is.

• Lower values make the voice softer; higher values make it tighter and more strained.

• Keep changes small; extreme values may result in unexpected performance.

Energy

Controls the power of the vocal.

• This is not simply the volume of the sound.

• For a gentle sound, lower Tension at the same time.

Editing Tools

Four tools are available on the left of the lane:

• Lifting tool – drag vertically to raise or lower the value. Create a selection on the grid to limit the change to a range, or hold Shift to change the whole clip.

• Brush – draw the curve directly. Right-click to erase.

• Eraser – erase your edits and restore the AI-generated values.

• Fixed brush – lock a section of the AI-generated curve so it is not regenerated when you change the notes, lyrics, or pitch, without changing its values.

Edits made with the lifting tool or the brush become user parameters.

Legacy Vocal Controls

Before Dynamic was introduced, V2 models used four separate envelopes: Power, Soft, Breathy, and Chest. Projects that already contain edits to any of these keep showing the four lanes in place of Dynamic, and they continue to work as before.

Power

“Power” controls the strength and intensity of the vocal delivery. Increasing this parameter gives the voice more energy and impact, ideal for powerful choruses or dramatic moments.

Soft

“Soft” adjusts the overall gentleness and smoothness of the voice. Higher softness makes the voice sound more delicate and soothing, suitable for ballads or intimate moments.

Breathy

“Breathy” controls the amount of airiness or breath-like quality in the voice. Increasing this parameter adds a whispery, ethereal texture, perfect for dreamy or emotional passages.

Chest

“Chest” enhances the resonance and depth in the lower vocal range, giving the voice a fuller and more grounded tone. This is useful for creating a warm and rich vocal presence.

To edit a legacy control, left-click and drag in its lane to draw the envelope, and right-click and drag to erase it. Erased areas return to Auto mode.