Hi George

According to the 9kPro manual, you cannot use the vocal harmony board in the 9kPro. Its too bad, because it might have been useful when applied to vocal samples.

Note, if you hold the sustain long enough, any synth will run out of polyphony. It is because of the layering possibilities that Yamaha's 126 notes of polyphony can seem like much less. Each patch can have four layers and you can layer three patches. This would leave about 12-note polyphony, which is easily exhausted using a sustain. Yamaha could avoid this problem by reducing the amount of layering available to us, but most would rather have the option. The reduction of polyphony due to layering is not a Yamaha-specific problem. I have the relatively new Roland XV-5080; I can easily configure it in performance mode so that its 128-note polyphony is reduced to 1-note polyphony. (Kurzweil's VAST is less prone to extreme polyphony reduction, but it starts with a max of 44 notes.)

The 9kPro addresses the specific situation of running out of polyphony using sustained piano runs, because you can add a piano card that adds 64 more notes of polyphony for the piano sound.