Hi Tony, The Jazz Tenor Sax on the EW-04 is superb, particularly in the lower register notes. You can really hear the sort of 'Clack' the reed makes at the start of the note. In my opinion, it's the best Tenor I've heard.
I haven't played around much with the brush pattern kit so can't really give you an informed opinion yet. Give me a day or two and I'll have a 'play around' with it and get back to you.
There are no dedicated Jazz Organ sounds as such on the EW-04. There are a few 'Electric Organ' and other organ sounds but I would not rate any of them for playing jazz. The best Jazz organ sounds without a doubt, are already built in to the KN7000
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Willum