3 strange cartridges from Sony that no internet site talk about

Hi people, I recently found 3 cartridges for MSX on a flee market and I can't find any information about it. the cartridges are labeled : CD Check Soft / slot 2 / Sony Hit Bit /part no 3-702-102-01 CD Check Hard / slot 1 / Sony Hit Bit /part no 3-702-103-01 CD GAINADJ Hard / slot 1 / /part no 3-702-105-01 The CD Check Soft is a normal cartridge. the CD Check hard has a hole with a 4-pin connector. the CD GAINADJ Hard is quiet big (like Phillips sound module) and there is a hole with a mal AC adaptor plug and a 5-pin connector) When I put those cartridges on an MSX, only "CD Check Soft+CD Check hard" works, and there is a menu with many setting possible and strange diagram Does anybody has some informations on it ??? waiting for your comments... /i/iathieu