The only thing you need is to add/load the instrument definition file for the sc55.
I think it even comes with the cakewalk/sonar cd, but anyway you can find these instrument patches on the cakewalk site as well or links to it.
I am not at my daw at the moment but if I recall;
options -> instruments -> define instruments -> add sc55.ins file that's all.
The manual of roland won't help you anyway with this.
take care,
Fred
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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