I was playing around with a keyboard at a Guitar Center that had an auto-harmonize feature. Below a certain note pressing a key would play a chord instead of a single tone. What was interesting was that playing chromatically (white and black keys) it played chords that retained a firm sense of key (C major) - if you jumped around randomly or did chromatic runs it didn't sound like there were a bunch of modulations taking place. What formula do you think it used to do this?
I want to learn to play keyboard, a continuation of sorts of this question. When I say this, I mean a MIDI controller - for the sake of being a midi controller, not as a stepping stone to piano. My goal lies primarily in doing something creative musically (dare I say "compostition" at some point down the line) with software synths played live (by me, not a tracker). So the answers to that last question have sent me on my way theory wise, but how do I learn to actually, you know, move my fingers around? [more inside]