Reply to tips for getting multiple controllers/mappings to play nicely together

What are some tips for getting multiple controllers to work together without conflicting (usually over FX). For the most part, if I'm using BeauBryte's S2 and MF3D mapping they work fine together (obviously built with consideration for each other). They don't step on each other when reusing the same FX unit.

I like Ean's (jam on it) FX configuration, but it trips all over BB's S2 mapping. FX units don't reset and/or unexpected FX get triggered. Unfortunately, per Beaubryte, his MF3D mapping is too complicated to easily swap out some of Ean's FX chains. That being said, I'd like to get Ean's mapping to play nicely with BB's S2 mapping.

What are some scenarios that might be causing the unexpected FX interaction?

Thx