I have a KN6000 and a KN7000 with pedals and all four expansion boards. I am a "reader" and mainly self-taught player. I did try formal lessons with a local teacher but found I could progress just as quickly on my own since I read music, so stopped the lessons. I guess I qualify as an ear player to some extent. I can sit at the keybord and usually work out the chords for a song, though it may take me quite some time to do it. However, I am not able to sit at the keyboard like a true ear player and have the melody and chords "fall" under my fingers automatically.
Chuck
Manchester, UK