In systems that used the YM2413, developers could create custom sounds and instruments by manipulating these parameters. A "instruments.bin" file could serve as a repository or library of these custom instruments, which could then be loaded into a system or application to provide a specific set of sounds. When combined, "ym2413+instrumentsbin" likely refers to a project, a software library, or a piece of equipment that utilizes the YM2413 audio chip and leverages or creates a collection of custom instrument sounds stored in a binary file named "instruments.bin". This could be anything from an emulator that comes with a library of chiptune instruments to a music production tool that targets the YM2413 specifically.