no sound on my keyboard

in fact I get sound from my keyboard when I put "roland XP 80" in the output column in the tracklist BUT the patches I get ARE NOT roland's, they are DLS apple devices's. Now when I put only "XP 80" in the output column, I get roland's patches list in the under menu but... no sound when I play ! its 5 past 12 in Paris, good day or good night .