I just look at MVS-1 > It also has a THRU - so question me this, why would one need to pre-"assign" channels to either? Or am I being too literal do you simply mean as a mental day-to-day procedural "rule" for DAW & controller use of them kind of like "channel management" when building a sequence?

Because there is no reason in some songs you might not want to trigger BOTH at same time on same channel - but with different sounds or maybe even the same sound (layered, thicker, detuned-dual, ..) ?

Larry