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So I had an idea that I would change the Master System FM from it’s default “auto” to “disabled” in the core options, save the configuration and then inspect it and see if I could find the switch. But no, I do not see it. Are all options for the cores stored in the retroarch.cfg or anywhere else?
EDIT: Looking more deeply, it appears the option should reside in the retroarch-core-options.cfg. More specifically:
ym2413 = “disabled”
That *should* have solved the issue, but FM audio is still on, still set to “auto” in Genesis Plus GX core options. It doesn’t make sense. I feel I am so close :(