The secret of vocal modulations is that they are slowly morphing. For example when you say “hey you!” the transitions between mouth states are sweet and slow.
So if you want to emulate the human vocal tractus then you have to make transitions between DSP states slower.
When you deal with the *Filter native DSP, a parameter called “inertia” does the job and it’s hardcoded ; but in the native *MultiTap device, there isn’t any “inertia” parameter at all.
And using this MultiTap Device for creating a Formant Filter, by default, will result more in a “robotic voice” than a human voices, why, because robots slice their vocal expressiveness in some predefined states, that are changed without any transition.
That’s why adding some Inertia in the MultiTap Sliders is so important.
kraken/gore used the Hidden Formula Device to make it : thanx to this, all your automated sliders can behave like the typical intertia slider.
You put it “between” two meta devices. Check it [there]. You just have to copy the script in the clipboard and paste it in a chain.
But using this special Fomula Device between your 2 hydras and your 2 multitaps will probably make your cpu usage a bit more intensive.
Anyway, your technique gives pretty interesting results, indeed, especially on the bass domain where we’ll always searching new sounds and new perspectives.