I have the same problem with my MVS. I just says no sync
I suspect it is because neo geo have a non standard refresh rate. Yours will be too high and mine too low. I don’t know what the fox is for that. I have tried to find info on overclocking the gpu by 1% to bring it in line, but can’t find anything and it shouldn’t be necessary
Can marqs please take a look at neo get for the next update?