There are ton's of free patches to be found on the net.
A good place for finding them is here:
http://www.synthzone.com/kurzweil.htm
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76