Need Some Help Getting My Controller Working Right on the New Genesis Core

[Riptide]

Hey all. I've had my mister configured how I like it for so long that I seem to have forgotten how to do something. I use an 8bitdo m30 2.4ghz with usb dongle for genesis games and it works great on the old genesis core, but when update_all grabbed the new cycle accurate one I found 'A' and 'B' to be swapped. I could've sworn there was a way to remap for an individual core, but I've looked through all the core input settings about ten times now and can't find it. Apologies if I'm missing something obvious but any guidance is appreciated.

[CMR]

When you're in the OSD menu for the core, press right. It should change to another menu and there should be an option to map core buttons.

[Riptide]

When you're in the OSD menu for the core, press right. It should change to another menu and there should be an option to map core buttons.

That did it, thanks!