Alternate Stage Loader with Alternate Stages (Spear Pillar and the like)

[Allav866]

I'm trying to figure out how ASL works with Stages that have alternate forms that load differently, especially Lylat Cruise, since it consists of multiple parts. Can somebody explain how i could replace these stages using rels and using ASL code? I also need to figure out how this would work with button combos. Like, would the Button Combo load first or would the game load the Stage's alternate form first?