https://lua-api.factorio.com/2.1.13/prototypes/AmbientSound.html
4.247 Failed to load mods: Error while loading ambient-sound prototype "after-the-crash-for-nauvis" (ambient-sound): AmbientSound::planet is obsolete. Please use AmbientSound::planets in property tree at ROOT.ambient-sound.after-the-crash-for-nauvis
https://lua-api.factorio.com/2.1.13/prototypes/AmbientSound.html#play_on_all_surfaces opens up some interesting options - specifically, there's no need to have a track defined for each surface anymore. If I'm reading correctly what the mod currently does (just started using it 2 days ago), and it adds the non-hero tracks to all surfaces, I think this new approach should work better. I'll open a PR on GitHub as soon as I can figure out how to run this alternate path if game version is on the new API.
