Hey check out this MP-3 from a member on the "Painoman's WK-Studio Forum". It was recorded using the preset stereo grand on the Casio WK-3500. Even though it's an MP-3 I think it really shows the quality of the piano sample on this keyboard. If you like this piano sample, you'll love the newer 3700 because it has an even better one.

Squeak
http://www.cheshirepianist.co.uk/CasioWK3500Piano.mp3
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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.