How to Mark Tone in Complex Tone Systems

If you have a complex tone system and every single syllable has tone, you kind of have to. We have something that's a so-called neutral tone, which gets no mark, but that's a little weird and hairy. One problem you may run into if you like lots of different vowels and super-signal in your vowels is gets a situation like Vietnamese where you have to put some diacritics underneath. Thai is the one that has tone and nasalization.