Catalyst is a synth with a focus on creating interesting sounds by creating dynamically evolving waveshapes. Catalyst produces hybrid waveforms by taking two oscillators, applying half wave rectification, then sticking the results together.
The design idea came from the book Electronic Music Circuits (Howard W. Sams & Co, 1982, Klein. B.). The concepts may not be that familiar, however the synth has been designed so that each control does something meaningful and useful, and programming becomes very intuitive.