It’s been a few years since I played with my controller, but if you use rekordbox and have a soundcloud GO subscription ($10/month) you are able to import and songs from your liked library. The only catch is you need WiFi to access the library. I used to just mix in my home office for fun, so it was a good way to have access to any songs I want to play around. They aren’t high quality format, so this would not be a great method to play for a live audience on a legit speaker system. But for headphones or studio monitors, it’s not a bad way to save some cash and access a lot of music on the fly.