If you really want to take it a step further, most of the samples in these games were made using a Roland SC-88 sound module and downsampled to fit into a GBA cartridge.



I was playing around a while ago with the Roland Sound Canvas VA plugin that replicates the high-quality sound of the old hardware. (The only things that can't be perfectly simulated are the square wave synths made by the Game Boy itself)

Huh, it does sound pretty good with minimal differences (as in still highly recognizable). I don't think I'm going to redo the OST again though, I mainly liked just having the OST and my ears not bleeding from the fuzziness. (Also I broke your post in my quote because I can't post links yet :p)