I never bothered UD because I got the Motif and I like the piano sound on it. I also find the piano sample to bne theweakest link on the whole board. I guess you'd have to buy that "special" Korg 8mb flash card ( a little to high at the asking price for me but it might be well worth it for you ). I also didn;t buy the card it because initially Korg stated that you could not use multisamples and that basically meant that all the samples were "one shots" that could not be transposed ( pitch ) along the keys. ( Good for drums and percussive or specialty sounds but not much else ). I understand that with the OS upgrades that Korg LMP multisamples can now be used and any instrument can be sampled and transposed on the keys.
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AJ