Mastering Music Online will synchronize any YouTube video to the loaded song by opening the YouTube video within Mastering Music Online.
This can be done using drag/drop or by pasting the video URL into the video URL field in the Open Video window.
You have the option to mute/unmute the video audio and to position the video to start at any time during the song.
When you save your song to your Google/One drive, the video link is stored with the song and will automatically open when
the song is re-opened.