I’m working on a complete rewrite of the Dreamcast DLC mod to practice making something that uses C++ classes. With the new version you will be able to modify original SA1 DLCs and create completely new DLC content that will work in both SADX PC and SA1 Dreamcast with a simple conversion (except custom sounds and music which aren’t compatible).
Some features of the old mod won’t make it to this version. For example, all Twinkle Circuit settings in the old mod will have to go. To compensate for it I made this little menu that will show up when you enter the special gate that appears when you enable the Samba GP DLC. The look may or may not be final, I’m still messing around with its design. I’m a bit limited in how much I can do in it.