Korgy,
I may be speaking out of turn,since I don't own either one, but Uncle Dave has a PSR-9000 & 9000pro. He uses his left hand for the bass line. I've heard him say several times that any KB that he owned had to recognize chords made by the right hand.
To the right of the split.
they're much to expensive for me!
Have a nice day,
Nobby

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Nobby