The problem is that everyone implements those nonlinearities as isolated and largely static things, which they are not, they are dynamic and interact in complex ways. From what I can tell the vast majority of people who implement these models don't seem to really understand the analog world, they model the circuit in spice and run a simulation at a static setting with a single source and call it good, this kills the dynamics which are a fairly important part of the sound. This is also why many amp modelers are often said to do the high gain or clean sounds well but fail in some vague way on everything else, the simplified dynamics used for modeling are close enough to reality for those sounds.

The mini VCF is not the best option for my needs but it is useful in that I have a good many implementations to use as controls as the patch advances and I can show why it all matters well enough, I can provide musical examples which most anyone will be able to hear the differences between. Ultimately I think the software folks are making the wrong sacrifices which is why pedals like the Sans-Amp series and even the somewhat naive Run Off Groove [0] DIY offerings maintain a solid following despite not sounding much like the amps they attempt to mimic, they do respond like the amps, they maintain the dynamics or at least something close enough.

I am not sure we will have much to talk about but I will give you an email when I am back on the computer.

0) https://runoffgroove.com