About rhythm sound - onitama/mucom88 GitHub Wiki
If you find the following files in the same folder as MUCOM88 Windows, they will be used as sample files for the rhythm sound source. If you want to use the rhythm source section, you need to prepare a separate file.
2608_BD.WAV
2608_HH.WAV
2608_RIM.WAV
2608_SD.WAV
2608_TOM.WAV
2608_TOP.WAV
The sample files for the rhythm sound source can be downloaded from the site, as well as sampled from the actual board. You may also want to consult the following sites