Weedwacker is technically subtractive, but itâs such a unique ensemble that I would still consider it essential for your list. Itâs pulse waves where the output is fed through a bandpass filter and back to PWM. Itâs possible to get extremely interesting harmonically tuned chaotic feedback, thereâs just nothing else like it, Iâve been toying with the idea of making a hardware version, but I donât know, it sounds so good in software, really upsetting the idea that only analogue can be âorganicâ that it might be disrespectful to do so!
You should also check Adlais by David Elson. I think itâs original inspiration was the Scott Stites Klee shift register sequencer, but itâs something different. Really interesting semi generative evolving patterns.