UGen for self-oscillating filter?

Questions
1

Is there any UGen that can get a filter to self-oscillate, like turning the resonance up to a point where it starts to self-oscillate?

2

in sc3-plugins, there is DFM1. haven’t really played around with it, but might be what you are after?

3

I posted some code for comparing lowpass filter ugens on the mailing list a few months ago, you might find it useful. As I recall, a number of the filters can self oscillate, but you’ll notice not all of them are super accurate with the frequency parameter

https://www.listarc.bham.ac.uk/lists/sc-users/msg64563.html

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