i forgot to say--dub is a producers form--it comes out of the practice of recording instrumental and vocal tracks seperately at studio one and other big reggae studios. b-sides and later seperate plates would be issued of the instrumental tracks reprocessed by various producers--so all the name i posted above are producers.
another very cool offshoot of dubculture is the sound system clash---to get an idea, you should check out rodigan's webpage
http://www.rodigan.com/intro/intro.html
flip the power switch on the mixer that turns up when you enter and all will become clear. i think there are soundclash recordings (of the battles between soundsystems) on his site--if not, do an audio search of rodigan and you'll find some--most are very cool, though it is a little difficult to play them as loud as they should be played on a home system.
http://www.jamworldreggae.com/sounds/sounds.htm
my friend, the good dr bindujeet--who told me about rodiugan--also claims that the world sound system clash happens in brooklyn every november.