FormatTable (from the LJP classes) is maybe worth a look? Here's a demo: https://listarc.bham.ac.uk/lists/sc-users/msg48380.htmlYou'd probably want to drop the base frequency by an octave, and change the oscillator, find a FormantTable setting you like -- or mix a couple simultaneously, at different settings, for variable harmonic layers?
Overtone singing is a method to alter the formants that you have learned when you learned speaking in a way that they become single resonant frequencies. This is effectively done by creating helmholtz resonators in one's mouth (between lips and tongue) and by tuning the vocal chords to the appropriate spectrum. This is why it sounds so "artificial". To model this artificially, it may be interesting to investigate in the imperfections and transitions between techniques and styles. Techniques like sygyt are easier than kargyraa, where the vocal chords behave more nonlinearly. For a simpler model one may start with a Blip and a Ringz.
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