Most engineers know the 3:1 rule but not why it works. The answer is in the comb filter transfer function and the inverse square law and the math tells you exactly when a 2:1 ratio is enough.

https://tonalux.org/blog/comb-filtering-3-to-1-rule-explained

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Why do some tube and transistor emulations sound noticeably more "alive" than others? Often the answer comes down to a 1971 framework called the Wave Digital Filter, which sidesteps a problem that breaks naive...

https://tonalux.org/blog/wave-digital-filters-analog-modeling

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