The behavior of the resonance does seem to dependent on transients. I'm not sure what makes that happen but as I mentioned, you can get the filter to ring just by sending triggers to the trig input. It works great as a drum voice, without the need for an envelope.
It sure is a very clean filter when using conservative settings, high-end OPA opamps and THAT gain cells all the way through. But when you push it, it screams and growls.
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