After extensive testing, it seems the Ogg playing is more or less functional.
I still need to tweak it for different Choons. Flappadiddle-Doo's struggling when it comes to switching levels. But other than that it's pretty much working as expected.

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Today I need to focus back on the main AGameAWeek for this week.
Given that I spent ALL DAY yesterday hacking at the 3DS, I haven't actually done anything more on the game, so it's still pretty much at 1% complete.
It's usually around this time that I scrap such a minimal project and do something entirely off the wall, and that's the kind of mood I appear to be in, right now.

So, expect an oddity to arrive, soon!!