BC,
Most keyboard sounds are unique to the individual brand of board. And, some earlier model sounds (voices) often cannot be used with newer models. More often than, you are limited to the sounds within the keyboard, and some variations of those sounds that have been modified by others owning the same board. As for the price of the addapter cable, you may want to do a Google search for the cable. It's possible you may find it a bit cheaper on another site. I paid $40 for mine in a music store. Keep in mind the adapter is universal and can be used with any keyboard that has midi capabilities.
Good Luck,
Gary
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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)