I was looking to make an interesting sound with a lot of low end. My intention was to have the sound both felt and heard – something close to the 20hz low end range of human hearing (you need speakers that can reproduce tones that low). In working on it, I could hear speakers in my headphones buckling in and out – and it made my head feel funny, so I think I stumbled on to something cool. Also – Here’s a pdf of a roughly sketched patch diagram -> Humdinger Patch Diagram
Enjoy & caution, it could harm your health and/or speakers.