I have never experienced any problem with
polyphony on the 9000 Pro.
Like DonM has said if you turn on the
poly-counter & try with sustain on you can
do it.
I have played for Hrs. & then check the
poly-counter & it is never at 126.

Enjoying the 9000 PRO
Denny
_________________________
Denny
KN5000, Yamaha PSR-SX900