Well all of this sounds beautiful, and the reason for more than a couple BGS running is for ambient sounds that loop, like a torch, or that is the wrong way to look at it?
Viewing post in Focused Sound Effects PRO for RPG Maker MV and MZ comments
Oh, don't get me wrong. I absolutely do see the use case for "more than a couple BGS running", I just hadn't yet set up the plugin for it (still haven't written one that's gone public - I need to work out a way to STOP a BGS from running, since the built-in RPG Maker controls don't expect more than one at a time. Might use an "alias for each one" solution like the Soundtrack plugins use.)
But 16 is overkill, to say nothing of 200. Performance-wise, it worked when I tested it, but... don't.
Sorry about that. Life and everything. But I had some time this evening, so I implemented it. I decided to go with the "alias" approach that the Soundtrack Manager uses. So far, I've only updated it for MZ (since that's the system I was originally testing with; normally I would do MV first) but the MV update shouldn't take too long.
EDIT: MV version updated too.