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Changing pitch in audio will make the voice be higher when sped up or lower when slowed down.

Change Audio Pitch

1. Double click the audio file in the timeline. In the popping-up window and under Volume, drag the pitch slider right to set the pitch up, and drag the slider left to set the pitch down.

2. Click the Play button in the Preview window to check what the audio sounds like. Click the Reset icon to restore the pitch settings.

3. Click OK to save the pitch changes in audio.

change audio pitch
Change Audio Pitch
Adding a semitone is equivalent to changing the overall pitch by one note in a 12-tone scale. For example, C to C# (Sharp). The same to removing a semitone.
Modifying audio speed by adjusting the pitch will not change the audio length.