I would absolutely love to have support for the Denon HC4500. I own a DDJ-S1 and the controller works flawlessly with SDJ 1.9. Very pleased! But for anything outside an office / production room, nothing beats a good old 19" rack for mobile use. I'm old school, in case you haven't already noticed.

My Rane MP-22z is still the best option around and still sounds better than almost any mixer out there. It's perfect for mobile gigs and the HC-4500 is a perfect controller to sit right below it. It's a very simple controller, and all of the buttons / features on it are features that are all available in the newest SDJ. I understand cutting off support for older controllers to bring in new features, but the HC4500 is an industry standard and it would be so cool to keep it, especially since it's the only one in the 19" class. Just let SDJ send 2-track audio to the decks, and let the mixer do the rest of the work. Would love to know if this is possible, thanks!