All New Radical Synthesizer 14. Adding Noise To The Drive

We're designing a radical new synthesizer and we've decided that we're going to using custom hardware and an STM32 Nucleo to create a player interface. We're using a Windows PC to generate the sound and communicating between the two using USB.
We have a synthesis algorithm modelling a hypothetical system we called the "bowed bottle". In the last video we also started trying to add some "bow" noise to the sound but there was something wrong with it.
In this video we start out fixing this problem but, in the process, find a fundamental problem with our model. followed by lots of head scratching and scribbles on paper...