The full piano mode concept would make sense, but it doesn't work. Unless you play super simple stuff and/or help the keyboard to recognize the harmonic content, the result is hardly musical. It's really not a problem for me, as I hardly use the arranger features for live performances. I record the chord progression alone, or just loop it and only then I'm able to play what I want without getting conflicting notes.

There's absolutely no way for any of these keyboards to be able to fully understand the relationship between notes in a phrase and cluster....and then add the sustained notes to the mix.

On Korg forums many have disagreed with me on this over the years, so I have challenged them to show a demo. Either I got a ding dong "Piano" track...they got offended and said they don't need to show anything to prove....or they're too busy and simply disappeared!

Until I see a real person doing this in real time, the FULL piano mode is only ok bordering on useless. I don't blame the keyboards for this at all. Music is much more than a simple math. Harmonic content is not only decided by what is being played already, but also by what comes next. Any given note can be a passing note, or a chord tone depending on the next move and that's just a basic issue. No keyboard can guess that. The human element associated with all this is too complex but that's music.