Anyone know what it was modeled after?
which one … there are four (technically if you throw the base/width one into the mix)
anyway Ess mentioned on a stream that the 4 pole was based on a well known ladder filter - hmm, no prizes for guessing that then !
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either way, they sound great.
it be cool if the added a LP3 Filter modeled after a well known Roland Bass Synthesizer
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this is what Roland say about that 
can be switched between a square and saw wave before sculpting with the 24 dB low-pass filter (often misquoted as 18 dB, 3-pole)
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that’s interesting, I just dug this up.
Blockquote The TB-303 filter is actually a flawed 24dB/oct design, making it more like a 18dB/oct filter. It is a unique 4 pole diode Ladder Filter (the diode ladder was an invention of Bob Moog’s) which uses transistors instead of diodes which gives the response of a 3 pole filter.
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hmm. aren’t there several well known ladder filters?
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Whatever they are modelled on, they are some of the most characterful digital filters I’ve ever heard, super underrated superpower of the digitone imo. Props to the dsp team 
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seriously, they are wonderful. absolute props to the DSP team.
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