I haven't heard it. If it sounds natural and like a pretty good pianist played it, then that is probably the case. Granted it will still be MIDI rendering by the CASIO's sound engine, so in a sense it is being created by a computer also. But some things are much easier to capture by having someone play the darn thing rather than trying to edit note for note a MIDI file using a computer mouse: dynamic phrasing, rubato, proper voicing of multiple lines, etc.