PC2 - KB3 and reverb

When my old SP88 died I picked up a used PC2-76 as bottom board to gig as controller for my PC361.  I have been fiddling around with PC2 on its own in case I need its sounds as backup or just to play on its own. I am able to edit reverb effects of the base organ sounds - but using the KB3 sounds I cannot seem to add secondary effects to the KB3 (use A and B together).  
 

 Looking at the manual I assume that is because with KB3 resources in use the PC2 will not support also layering the second bank of effects- reverb for example.
 

 I thought I'd ask here to confirm in case I am missing something.  Shame, as KB3 organ without a reverb effect is rather useless. (also have not found way to dial in an overdrive effect)
 

 Thx, 
 -Mark Urquhart