Hello! Does this plugin apply only to BGM, or can it also be used for BGS? I would like to apply crossfade to two different BGS.

At present, only BGM. It's kind of a niche scenario, I'd think.

I do have a plugin that does things with BGS (Focused Sound Effects Pro), but not cross-fading, and it looks like I never updated FSEP for MZ. (Man, why did I never do that? I'm too busy today, but maybe I should in the near future.)