This is the repository of the project:
GitHub - stereomimi/Mezz-Estate-NeoGeo-Audio-Driver: An audio driver for the NeoGeo written in Z80 assemblyGitHubAn audio driver for the NeoGeo written in Z80 assembly - GitHub - stereomimi/Mezz-Estate-NeoGeo-Audio-Driver: An audio driver for the NeoGeo written in Z80 assembly
The way to format music is specific to this driver and there aren't any tools to compose music for the driver at the moment; but I plan to make one.
The driver itself still isn't complete, but it's somehow usable so it can be tried out...