The 4 effects block is a poor design on Korg...Some styles will only allow 2 effects within a style and others 4...same with SMF (only 2) and originated sequences on the Korg (2 and 4)...

Try removing effects from another sts part.....also what you may hear on the organ is a slow leslie in the sample..Wait till Monday and I should be able to check it out on my MicroArranger