Tony, most of the guys I know in this part of the world, which isn't nearly as many as there were a decade ago, rarely use the organ voices. Granted, they may sound great, regardless of the keyboard, but they're rarely used. I hear lots of pianos, guitars, saxes, but not very often when I hear an organ. Even in the three piece combos playing the bars and clubs. I guess in some areas they're still popular, but just not here.
Gary