It's hard to really judge audio critically because of all the background noise from nearby booths at NAMM. But the analog modeling and modulation control sounded very natural. Alesis have done a great job on it. Also the FM and physical modeling sounded very convincing as well. I have always been a big fan of FM so that is a big plus for me. And all the synth engines can be combined so some serious patches can be created on this machine.