PSR-S950 - Set Split Keys to All Chords

[apcdog]

I have a recollection from an older Yamaha keyboard I used to own that allowed me to set "split-keys" to the last key on the board, that set the entire keyboard to play only chords in multiple octaves moving up the keys.  I have tried to replicate that on my PSR-s950, but I only get the one "base" chord octave from the lower end "chord mode" keys.  Hope this is clear.  Again, I set "split-keys" to the last key, but if I play the second "C" key, I just get the same chord octave from the "first" "C" key.  Any help would be greatly appreciated.  Thank you.