Alpha! / Not fully functional yet
is to provide you with the 100% BEST audio (-file) possible from any YouTube video (available in Lithuania, so even videos you can't even find nor watch with an e.g. German IP [ #FCKGMA ] are no problem unless you can provide the URL. :) )
This is because YTMuxer does NO RE-ENCODING (which inevitable alters the audio) and therefore results in OGG, OPUS or M4A files (which can be played by almost any player that plays mp3's. Or just use VLC.).
Options for (as-unaltering-as-possible) conversion (MP3, AAC, ...) such as normalization are planned.
Enjoy the music.