Difference is and it's a big difference...Tony has had the Kn6000 for a long while and isn't as familiar with all the other OS on most arranger KB units as I have experienced,......not bragging but the truth be told. For me to switch back and forth, etc, is of no consequence with the learning curve for myself. I tried to help Tony as much as I could and answer questions best I can. I don't profess the know it all mentality some do, but instead use my experiences of what I do know to help others when asked. Why it bothers you I could really care less judging by your continued condescending tone to most of my posts when I change units. But that's your problem.