Time Stretching Dialog

In this dialog, you can change the duration of an audio selection, usually without changing its pitch. You can stretch a selection to a specified duration (in minutes, seconds, and milliseconds), tempo (in bpm), or stretch factor (as percentage).

  • To open the Time Stretching dialog, select the Process tab in the Audio Editor and click Time Stretching in the Time & Pitch section.

This dialog is also available as a monopass plug-in in the Batch Processor window.

Source (Audio Selection)

Duration

If Edit Tempo is activated, you can change the tempo of the audio source. The number of bars and beats and the stretch factor is updated automatically.

If Edit Bars is activated, you can set the number of bars and beats and the signature for the audio source. The source tempo and the stretch factor is updated automatically.

Result

Target Duration

If this option is activated, the audio source changes its duration.

Target Tempo

If this option is activated, the audio source changes its tempo. For this to work, you must specify the original tempo or the number of bars and beats.

Target Stretch Factor

Indicates how much the audio duration changes. This parameter is automatically updated when you edit the other parameters, but you can also activate this option to edit it manually.

Reset

Resets the stretch factor to 100%, that is, no stretch.

Method

Preserve Pitch

If this option is activated, the pitch of the audio material is not affected when you apply time stretch. If this option is deactivated, the pitch changes proportionally with the time stretch ratio.

Method pop-up menu

The following options are available:

  • Select High Quality (Multi-Purpose) if your audio is not monophonic or speech.

  • Fast Preview is processed quickly and is best suited to quickly preview a setting.

  • Monophonic Material is best suited for single unaccompanied melodic lines. This option preserves formants when time stretching.

  • Speech is best suited for voice material. This option preserves formants when time stretching.

Accuracy pop-up menu

Allows you to select whether to favor duration accuracy or pitch accuracy when time stretching.

  • Favor Duration Accuracy preserves the length of the original audio.

  • Favor Pitch Accuracy can result in a slightly different audio length after pitch shifting.

Use Modulation Envelope

If this option is activated, the stretch factor is modulated over time. In the Result section, you can set the Maximum Stretch Factor for the modulation envelope.