The process of creating these tunes actually began in FastTracker 2. Thomas composed the tunes using samples from a Game Boy Color. The saved XM files were then converted to Game Boy Color binaries using a tool coded by Thomas Egeskov Petersen. The Game Boy Color hardware has two square wave channels, one wave channel, and one noise channel, but note that most in-game level tunes only use two voices.
Everything has been converted from the original XM files to MP3 for easy listening.