Korg Poly800/EX800 Users

my setup is as follows:

midi out from soundcard to novation ks-4 in, ks-4 out to soundcard 
midi in.  midi thru from ks-4 to korg ms-2000 midi in.  midi thru 
from ms-2000 to korg poly-800 midi in.  using fruityloops for midi 
sequencing. 

my problem is that no matter what receive channel the poly-800 is, or 
what send channel fruityloops uses, the poly-800 plays all of the 
notes.  example:  i have 3 midi out channels in fl, 1 on ch. 1, 1 on 
2 and 1 on 3.  poly 800 rcv is set to ch.5, yet it plays all the 
notes (well, what it can handle) from channels 1,2, & 3.  

is this a common problem with the poly800?  can it be fixed?  is 
there something i am not doing correctly?