Yes! You can add multiple soundtracks to your video to play simultaneously.
To add multiple music tracks:
Click on the music file or voice-over to add it to your project.
Then, click on another music track or voiceover and add it to the soundtrack as well.
You can add as many soundtracks as necessary.
To adjust the volume of the soundtracks, click on the soundtrack on the timeline, and from there, you can adjust the volume of the track.