Thanks for your interest in the project. and to answer your questions, this library works for standard Mapper 0(also known as NROM), and about NES Maker boards, i have to check their specific requirements but generally if your board supports NROM it should work fine, and yes this library has support for music but its a bit limited right now and we plan to work on creating a more advanced sound support and also create a music editor to make the process making sounds easier, we also plan to create a full tutorial on using this library on youtube, but thanks again for your interest in the project and if you have any questions feel free to ask