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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.

[1] PDF: https://pdfs.semanticscholar.org/8fba/b35e5235fa2f6006c0f889...

[2] Discussion on KVR Audio: https://www.kvraudio.com/forum/viewtopic.php?f=33&t=385262

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