From: Mark Bonder <bonder@aaron.music.qc.edu>
Subject: Organ idea

Here's something I did with my 1080 and controller in order
to get a serious B3 type sound.
Take the internal Organ-4 wave (I think that's the one, It's
the one tuned a fifth up) and bring the filter down a little
bit.  That makes it sound like one drawbar.  Next, copy it
8 times and tune to the intervals of a Hammond (ie, root,
octave and a fifth, octave, 2nd octave, 2nd octave+5, 3rd
octave, 3rd octave+M3, - +5, and fourth octave.  
This will give you a seriously fat sound, as it's using 9
voices per note, but what you can do from there is control
the level of each voice individually using controllers, and
in this manner you can simulate drawbars.  
Let me know if you try it..

(in his second mail Mark describes in more details:)

Yes, actually I do do this within a performance.  Basically, I have 5 
copies of this patch (the single drawbar), and one that handles the 
'percussion' sound of it.  Each of the 5 patches is set to respond to a 
different controller for volume levels.

As such, I have the percussion and the first five drawbars on one 
channel, and the last four drawbars on a second channel.

The percussion patch is a two voice patch, one for the 2nd perc, and one 
for the 3rd.  I use sysex messages live to turn each voice on and off, 
and also to switch the percussion part between mono and poly (Important!)
On a real Hammond, the percussion only sounds on a non-legato attack.  To 
simulate this, you need to have a mono percussion.  Of course, to play 
chords, you need poly, so you have to be able to switch in between.

I use a JLCooper Fadermaster Professional as my drawbar controls and 
percussion switches.  This way I can manipulate them and change the 
sound around as I please :)