Stretching audio

Choose Process > élastique Timestretch to time-stretch and pitch-shift audio while maintaining control over all stretching parameters.

After you open the élastique Timestretch dialog, you can choose a preset from the Preset drop-down list, or adjust the controls as desired.


Choosing a stretching mode

Choose a setting from the Mode drop-down list to choose the stretching method that is best suited to your source media:

Mode

Description

Pro

This mode provides the highest quality stretching for most applications but requires more RAM usage and CPU power.

Formant shift controls are available only when using Pro mode.

Efficient

This mode provides good-quality stretching but uses fewer CPU resources.

Soloist (Monophonic)

This mode provides the highest quality stretching for monophonic audio sources.

Soloist (Speech)

This mode provides the highest quality stretching for monophonic speech signals.

Adjusting time stretch controls

In the Time stretch group, the Original Time and Original Tempo boxes display the original length and tempo of your audio.

Drag the Ratio slider to the right to make your audio slower, or drag to the left to make the audio faster. You can stretch the audio from 1/10 to 10 times its original duration.

Adjusting pitch shift controls

In the Pitch shift group, the Semitones and Cents sliders allow you to raise or lower the pitch of your audio up to two octaves.

Drag the Semitones slider for coarse control.

Drag the Cents slider for fine control.

Adjusting Formant shift controls

You can use the Formant shift controls to control whether the audio's fundamental harmonic frequency range is shifted along with the Pitch Shift value.

The Formant shift controls are available when Pro is selected from the Mode drop-down list.

As you adjust the pitch, the silver point in the Pitch/Time graph is updated to reflect the modified formant shift. You can also drag this point to adjust formant shifting.

The fundamental harmonic frequency range is specific to the instrument's or vocalist's resonating body (as opposed to the notes that are produced by that resonating body).

Drag the Formant shift slider to 0 (Preserve) if you do not want to pitch shift formants. When set to 100 (Match pitch), formants are shifted by the same amount as the Pitch shift setting.

Drag the Optimize for audio content max pitch slider to indicate which frequencies will be used as the format range. This slider is unavailable when the Formant shift slider is set to 100 (Match Pitch).