Thats amazing that Korg could possibly owns a patent on something that I'm pretty sure the Wright brothers used to control the first airplane!
Seriously though, I would not have guessed... wonder when the patent expires?
I just realized, I've never even had my hands on a Roland D Beam to see how they compare.
With just about any DAW and soft synth, its easy enough to map to an Xbox controller, and it's quite responsive even with a wireless controller. Yet, even as easy as it is to do I find myself not doing that much.