Eurorack Formant Filter comparison

I now find myself with 3 separate filters that do "formant" filtering, so clearly
it's time for a comparison. I'm literally getting my ya-yas out. And my yi-yis, and sometimes my wa-was. Just depends on where you turn the knob....
There are other formant filters out there, this isn't all of them, but it's all the ones I have, so don't assume this is the exhaustive comparison.
Formants are fun. And though I don't get into it much in this video, using
formant filters for "regular" duties with only mild formant effects can
be quite interesting.
Actually, using formants sparingly should probably be the rule. There's
definitely too much of a good thing possible here....
00:00 Intro
00:20 Gyrinx VCF
08:00 Morphing Filter Bank
18:10 Formantic

[@phpn99]

Unless you want to emulate mouth-based dynamic spectral modulation, I think we ought to think differently about formant filters and there is nothing intrinsically wrong with them. If you aren't modulating them much, they are an excellent spectral shaping tool. Traditional pipe organs, and several acoustic instruments are designed to shape the sound-producing part (flue or reed, for intance) using a mouth-like cavity, as well as the main resonator (pipe or other). The "mouth" in almost all cases (there are notable exceptions in some baroque organ registers) does not change shape according to the note's envelope, so the mouth is purely used to shape the static timbre. But you do get very beautiful timbres this way, that you wouldn't get by a simple LP/BD/N/HP filter. A good example is the Chinese erhu violin.

[@OldLight333]

Is this the vactrol or OTA version of the Morphing Filter Bank?