default config leads to this playlist: https://www.youtube.com/playlist?list=UU_aEa8K-EOJ3D6gOs7HcyNg as it contains all videos from NoCopyrightSounds channel which I really like and like music they share filters in files metadata-changer-master.js and music-ytdl.js
the idea behind appeared to me as I do not have unlimited internet connection and playing music from youtube used up quite a lot of my internet and that's how this appeared... in download.bat there is mpv used as I use this on my pc and then sync music to my phones
proxy from proxy-test.js file obtained from: https://www.freeproxylists.net/