Offizieller Kommentar
It will work with just a USB drive full of MP3s, but why would you buy an XDJ-RX to do that? To take full advantage of the XDJ-RX's features, you should by all means analyse your music in rekordbox! You'll not only be able to search and sort it, but you'll also have large overview and detailed waveforms with beat grids to better see and control your music.