Well, it didn't.
Ok so I'm a fucking moron, right, and as it turns out, fluidsynth just needed to be reset and I set my soundfont incorrectly so it was muted...
I still perfer Timidity for the WAY it's played, so if I can do that, cool - If not, whatever.
AHAH! I'M NOT A MORON! It is kinda broken - It only works sometimes, but I couldn't tell you what breaks it and what fixes it, it appears to be totally random.
I tried to record it but when it breaks, it doesn't play anything when screen-recorded, it's completely silent. My speakers make noise, though - so that's weird..