Don't get sucked in to the "Polyphony Whirlwind" The new sounds are no doubt made up of more partials to improve the quality. Remember, a 4 tone voice cuts you down to a 32 note synth before you play a note !
To be fair, Roland has always been very good with dynamic allocation of voices, so I expect the new stuff to be at least "AS GOOD" as the older stuff in that area.

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Uncle Dave