When you're in "Easy" mode, the keys (or in your case frets) don't actually do what they should in reality; They're just used to define generally what range the autoplay pattern gets centered upon (the actual notes played are governed by the selected chord). It's kind of disappointing, really; It should let you play real notes in conjunction with the patterns in my opinion.
The real bug, though, is that the "key" setting at the top of the UI that's supposed to update the available set of chords is completely wonky, and rarely does what it's supposed to (what, you wanted B? Let's go with A instead. You chose major? Minor it is!)
The real bug, though, is that the "key" setting at the top of the UI that's supposed to update the available set of chords is completely wonky, and rarely does what it's supposed to (what, you wanted B? Let's go with A instead. You chose major? Minor it is!)