Korg Poly800/EX800 Users

Hello all!  I just found a poly 800 on the side of the road and 
brought it back to my house.  After firing it up, I was delighted to 
find that it worked.  I promptly did the filter mod and got to 
thinking about other mods.  I have built 2 large modular synths and 
have plenty of experience with analog circuits, but this little 
bugger is a bit over my head.  Here's what I want to do. I would 
like to locate a point in the circuit where I could insert switching 
jacks that would tap into each of the poly 800's dcos separately.  
That way I would have 8(?) jacks on the back of the unit, each one 
corresponding to a voice.  I would want to get these jacks in BEFORE 
the filter in the circuit.  I just want the raw DCOs so I can run 
each dco into a separate filter in my modular.  Can this be done?  
Any ideas?
_rob Currier