mod, listening for the real KP3, I thinkt that the way to emulate it, is in that way. Because the formant filter is not modifying the feedback, only the delay (the first).
I had seen the vowel vocoder link and learned about it with some videos. But, I would need the formants of more materials. Or, any other way to get that "sound". I don't know, by adding another filter... what filter?
Let me understand... material filter is just an equalizer, with particular parameters?
PD: looking for vocoders, I found one you made, but diytanh.pd is not in the ZIP. So, it's not working. Can you upload in that thread?