Just a comment about "one finger" chords...I believe this to be true with Yamaha and Casio...I recall one of these companies has the non musical design...root and next key to the right makes a minor chord etc....it is so wrong to use ...

I will say that Roland does not use a one finger chord...the "intelligent " mode is designed for incomplete chord fingering and calculates the intended chord...It is very different from what I mention above...