Most of the issues of the Dynamic Allocation have been addressed, I think that when you use either layer sounds and or that have velocity switch in either the style or Right hand, I am not certain if it is the case that the Vocal Styles in question use it.

Note that not all the players have a "norm" on how to use it, I have also seen some mostly amateur players stacks 2 or 3 voices in the Right hand and using MOC (Melody on Chord) and to make things worse, play chord in the Right hand (mushhhhy)... most keyboards will choke.

In any case, in most of the arrangers forums, there are members that range from beginners and anywhere in between to professional players, and some MAY have bad playing habits. But if it is what makes them happy, more power to them.

One thing to say based on my own experience, among all the arrangers I had, considering the ones that have less polyphony like when I had my old Korg PA60 with only 62 notes hardly missed notes, and the "magic" is the Dynamic voice allocation processor that Korg use, is one of the fastest and best, perhaps, Yamaha needs to see how that works from Korg.
The current PA series has. PA2X&800 120notes polyphony, and the PA500 has 80...no problems here, even stacking up to 3 sounds plus the arranger, also considering that this board do not use any velocity switching or layer stacking sounds on the styles.

When I had my Ketron SD1, I had polyphony issues, since it had only 64, and even a single sound and a single note, where actually 3 notes...so, it was easy to chocked in you play a full chord + the arranger without layering sounds on the right hand, that was the reason I switch to a different brands.

Manuel

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mdorantes