This is great stuff. I've also done some work in the space, and did a writeup called "A matrix approach to the Moog ladder filter", which is a pretty different perspective from Vadim's, but the concepts and principles are pretty much the same under the hood. That's the filter in music-synthesizer-for-android, and I think it holds its own, both in audio quality and (SIMD-optimized) CPU efficiency.<p>[1] PDF: <a href="https://pdfs.semanticscholar.org/8fba/b35e5235fa2f6006c0f88975a2d528f7e9ba.pdf" rel="nofollow">https://pdfs.semanticscholar.org/8fba/b35e5235fa2f6006c0f889...</a><p>[2] Discussion on KVR Audio: <a href="https://www.kvraudio.com/forum/viewtopic.php?f=33&t=385262" rel="nofollow">https://www.kvraudio.com/forum/viewtopic.php?f=33&t=385262</a>
looks great, see also Julius O. Smith's awesome DSP tutorials: <a href="https://ccrma.stanford.edu/~jos/filters/" rel="nofollow">https://ccrma.stanford.edu/~jos/filters/</a>