twelvetone

Ciao All! I am building my own digital organ with three Fatar keyboards. I am looking at Midibox KB and it seems quite interesting (I already midified a pedalboard with the PIC core), but it seems it supports scanning only three keyboards. Are there any technical reasons on why I cannot scan more? I would like to try to modify it to support three, even if the scan times slow a bit I think it should not be a big deal (for me at least :) ) Thanks! Rodolfo