Gutter synthesis is a synthesis process that creates very physical, acoustic-like sounds with purely digital synthesis processes. Importantly, the system behaves a lot like the acoustic instruments: it can be unpredictable and unstable, but rewards longer term engagement with a diverse array of different sounds and behaviours that can be teased out and explored.
The synthesis is based around a discrete implementation of the damped, forced Duffing Oscillator, a nonlinear dynamical system that has been studied extensively, and often serves as an introductory example to the subject. The standalone for Mac or Windows is available for download from the project link.
Video example included in slideshow. Audio example: