Just because something might need a conga part, or some good shakers, or a little hand percussion doesn't mean it is a Latin song. Plenty of percussion of all kinds of genre's, Larry. Remember, they ain't loops, just kits (and some MIDI files to drive them). A well programmed cabasa or tambourine pattern can help lift a chorus, or allow for a more stripped down drum part...
Thing is, if you are replacing out the S900's drums with something more realistic, why not replace the latin perc too?
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An arranger is just a tool. What matters is what you build with it..!