In case you didn't know, the Mega SD allows for MSU1-style replacing of cartridge audio with .WAV audio. It's certainly beyond my capabilities though, but is there anyone who frequents Sega-16 that can do this? Here are Terraonion's docs - https://downloads.terraonion.com/pub...DEV_Manual.pdf
There is some dude working on Moonwalker but he's waiting for MAME to be updated for some reason. Not sure what that has to do with anything. Maybe someone else can do it in the mean time?