Just wondering if there are any audio effects/filters in an extension for MMF2? Not sure how reasonable it is to expect a feature that that to exist, as I don't know a lot about audio. Maybe it's not as easy to distort/alter audio as it is graphics?
Anyway, if such a thing exists that'd be cool. Ideally I'm looking for speed up/slow down or just something subtle to alter the music slightly under certain conditions.
You can alter the frequency of a sound at run time, and that's about it. For any advanced effects like EQ, you'll have to use a separate sound file and fade/swap between them. There's also a widget by Nifflas that can add echo and stereo effects to sounds - but it's not a magical extension, just some clever coding.