It should be applied to the CDI image, preferably for the DCCM group release avaialble on web.
You will find all the important information in the Readme file.
Only Discjuggler CDI image is supported, not work on GDI or other rips (es. Redump). CDI is universal image to all emulators (like Redream, Flycast, NullDC, Demul) and real console.