If you are looking for the actual data to put into your instruments.bin :
The ym2413_instruments.bin file contains the for the chip's built-in sound presets. Its primary features include: ym2413+instrumentsbin
If you grew up with the Sega Master System, MSX computers, or early DOS games from developers like Sierra On-Line, you have heard the YM2413. Often nicknamed the (FM Operator Type-L), this sound chip was a budget-friendly yet powerful FM synthesis generator that defined the audio landscape of the late 1980s and early 1990s. If you are looking for the actual data
This is where the instruments.bin enters the story. The YM2413 allows you to overwrite one single instrument slot with your own custom FM data. That data is a binary blob—exactly 8 bytes long—that defines the chip’s four operators and their routing. This is where the instruments
But in practice, instruments.bin for YM2413 emulators/players is exactly 48 bytes (6 × 8?) — no: famous example from :
On the MSX computer scene, music trackers like often used .MBM files. These files used a generic "instruments" definition file. If you are trying to play old MSX music, you might find a file named instruments.bnk or similar.