Not really. Dub came along as basicly the first kind of 'electronic music' in Jamacia. They would use horn, drum, whatever tracks from other recordings and most of the origional stuff added an origional organ on top of them, and they would be mixed by a producer and then usually used in 'toastings'. That was basicly two or more MCs that would rhyme, chat, skat, whatever in compition. But now it's a totally diffrent kind of music, but still heavily uses sampling and instermental tracks. When reggae style vocals are places over it it's usually called 'dancehall' or 'ragga'.
~ Phunkin' Phatt Phreerider ~