Click the "Record" button to record a voice, sing or speak into a microphone and click "Stop" to stop recording the voice. If you already have an audio file with voices that you want to change, click "Project," "Import Audio" and double-click on the file you want to change.
Click the left pane of the audio track to highlight all of it.
Click "Effects," scroll down and click "Change Pitch."
Click-and-drag the slider under "Percent Change" over to the right. Click the "OK" button.
Click the "Play" button and listen to the voices in your audio. If you want the voices to be higher or lower pitched, drag the slider to the desired setting.