Yeah that is I'd say one of the BIG limitations to the Casio WK's. It would be different if the samples were single layered. Since they've up the voice quality and added multiple layered sounds the 32 note poly just don't cut it. They should have increased the poly. Even 48 note poly would make a difference.

Squeak
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.