The Vongplayer app was originally released in 2013. Its audiovisual multi-track concept was unique and surprisingly, there are still few other apps out there trying to make the musical art of multi-track videos more friendly.
The 2020 reboot brings the video 4-track back for another play. The features are still basic, but in the full-version you can mixdown multitrack videos to edit and share wherever you like. The other main thing to know is the app stores all its videos and .vong projects in the default video library on Windows.
Install the Vongplayer AV Multitrack via the Windows Store