1. Open the operation area of pr and display two tracks of video and sound.

2. Click any track, right-click the option that appears, find the unlink, and click the unlink.

3. After unlinking, the following two tracks will be displayed in different colors. Prove that the unlinking was successful.

4. The video track is above and the sound track is below. Delete the video track above and you can export it normally.

5. When exporting, change the format to mp3, and you can export the sound separately.

The exported music can only be used for personal use, not for business, which is illegal.