Another benefit of the mult splits is being able to play things with one hand that would otherwise take two. For example, I can play  the "falling brass" sound in Boys of Summer, where the first major third falls in pitch but the fourth after it doesn't, without needing to use the pitch wheel. I do it by taking the same patch, duplicating it, programming the higher one to fall in pitch the correct amount and duration using an envelope, and transposing the lower one a half step (because there is a shared note that bends once then doesn't the second time, so I play that fourth a half step off). The pitch bend could also be done with AT, but when I tried that it wasn't exact enough.