@jaffasplaffa Yeah, it is overkill for a bass synth, just threw it out for the info. Craig Anderton wrote an article on putting the theory of the Hutchins article to practice, he tends to be more practical and less theory than Hutchins and his article may give you the exact mixing ratios for the various modes if you want to avoid the math, a search for "Craig Anderton Multiple Identity Filter" should find it. There is also some information in the Matrix 12 and Xpander service manuals. I do not recall how into depth any of these go, but they are certainly more terse than Hutchins.
The pulse really does need to be reworked, I was heading out the door and threw it together quickly in a way that would clearly show how it was done, the [send~] and [recieve~] is a little silly, a couple [*~] would do better and and make PWM much simpler, using the triangle to trigger the threshold might be better, or skipping the triangle and just using a copy of the saw which is 180 degrees out of phase to get the other half. It was done lots of ways in those days. These early waveforms were not completely accident or a failing of the technology, Bob could have gotten perfect waveforms if he wanted them, but perfect waveforms are less useful when it comes to subtractive synthesis, having some extra harmonics to play with is good. While the triangle has a fairly saw like sound to it, once you run it through that filter of yours you will easily be able to get a great sounding triangle when you need it, and unlike a more pure wave you can easily add in more harmonics, even with a very simple signal chain like you have in the mini, just turn up the cutoff frequency or use the filters envelop to do it for you if you want a more dynamic sound, or turn up the triangles volume on the mixer to drive the filter harder and get some distortion, no need for waveshapers or more waveforms. Bob really knew what he was doing, unfortunately others said "our waveforms are more pure!," the market followed. The mini is probably the most nuanced synth ever designed.