Version 1.0
This is a program for windows that can import audio files into gbatroid games. Can be used with audacity to convert mp3 and wav into music or sound effects in the game. Instructions are in the readme.

As of 2025 it is the easiest method of including custom music in a gbatroid hack. Using Sappy and other tools, midi's can be imported but the way instruments are handled, this requires a lot of effort. GMI can be used to convert songs/sfx from common distribution formats (mp3, wav) to a format the GBA understands. The downside to this is that it eats up a lot of space, and GBA roms are limited to 32mb - 16mb for ips patches. For music in full hacks, it should be used somewhat sparingly, as this method uses (very roughly) 73 seconds of audio per megabyte. A vanilla rom uses about 8mb, leaving 24mb of possible expanded space free. which translates to enough space for roughly 29 minutes of custom audio.

Because of this, it is the best tool for custom sound effects. But there is not enough space to use it for a complete custom soundtrack. Can be used for music, but be mindful of space.





There is alternatively, a Program hosted online that converts a raw audio file into an ASM patch that replaces an existing track with that audio. Works for both Fusion and ZM, read the instructions carefully for best results. Nisekoishi wrote the front end for this.

https://nepnep.world/raw2asm.html