Just as the title says, most creators use GP files to make a CDLC, it's also possible from text tabs. But for songs that haven't got any tab available, you can try it out with Chordify. https://chordify.net/ Works best for easy songs (your typical 4 chord song) (pop,hiphop, rap, punk songs) Also modern songs with easy BPM and timings.   In this video I show you how to create a Rocksmith 2014 Custom Song (CDLC) with Editor On Fire (EoF) when there aren't any tabs available. To understand anything