[Game Maker 8 Pro]Comprehensive Gameboy Zelda Engine

[Koh]

Game Maker doesn't naturally support fading in and out non-MIDI files; you'd have to use extension packages for that.

Wow that's... kinda surprising. You'd expect functionality like that to be standard
I'd recommend it if you have the option, though. It'd aid to a degree in immersion. I always find jarring sound changes like that to instantly 'eject' me, if you know what I mean.

Don't worry, I wrote the code anyway, but it won't work on the MP3s xD. I've never used extension packages before, so it would be a first, but first I want to get as much done on my own as possible.