Below are some technical papers that will hopefully contribute some knowledge and algorithms to the DSP community in general. This knowledge is placed in the public domain.
Non-linear Analog Modelling / Signal Processing
From Circuit To Code: Under the Hood of Analog Modelling
https://www.youtube.com/watch?v=eGcqomH6aAc
adc-2020-andrew-simper-circuit-to-code-slides.pdf – From Circuit To Code: Under the Hood of Analog Modelling – Slides from talke given at the Audio Developer Conference 2020
Dynamic Smoothing
Linear Analog Modelling / Signal Processing
Trapezoidal integrated filters
OnePoleLinearLowPass.pdf – One Pole Low Pass Filter
SvfLinearTrapOptimised2.pdf – State Variable Filter
SkfLinearTrapOptimised2.pdf – Sallen Key Low Pass Filter
SVF-vs-DF1.pdf – Noise performance plots
SvfLinearTrapAllOutputs.pdf – State Variable Filter Simultaneous computation of all outputs
Sin only coefficient computation in state increment form for low noise and high accuracy
SvfLinearTrapezoidalSin.pdf – State Variable Filter with Sin only coefficient calculation
SkfLinearTrapezoidalSin.pdf – Sallen Key Filter with Sin only coefficient calculation
Input mixing multimode filters – individual inputs for low, band, and high
SvfInputMixing.pdf – State Variable Filter with Input mixing for low, band, and high
SkfInputMixing.pdf – Sallen Key Filter with Input mixing for low, band, and high