I've been trying out the titles that are supplied with Total Replay in my Platinum //e system that has a Mockingboard clone in slot 5.
So far, none of the titles I have tried have provided any Mockingboard sound. Even with the titles that ask for the installation slot. I'm not very happy. Perhaps my clone is not working properly.
I've added a feature request for Total Replay to configure/detect and then convert games to the correct slot.
https://github.com/a2-4am/4cade/issues/43