Maybe you should do it the way it is done in the JV 1080.
You press parameter, then effects, scroll down one time, and then in the "perform efx type" page should be a "source parameter" which says "perform", there you should put the number of the part that have the sound which you want to effect. Then scroll back up and press pallette and look for the part that have that sound and instead of "MIX", set it EFX or PAT, whichever works best.
Hope it helps.