The chords that RealiBanjo recognizes are major, minor, dominant 7, minor 7 and suspended 4ths. So you have to be careful that you’re actually playing a qualifying chord. It’s not that hard, really, but a number of people have written, asking why there’s no pattern when they play a D, an E and an F. It’s because . . . it’s just a bunch of notes, not an actual chord.