For the rest of the one (or possibly two) fingered brigade - with limited keyboard chops (self included) - you might find this homespun technique of mine useful. In order to build up song chord tracks, I find building up chord patterns in Scaler a useful way to do it - either select from the pre-set patterns or come up with your own. You have seven patterns to work with in a grid and eight chords per pattern. As soon as you start using multiple patterns, Scaler will assign a key switch (sta