Stochastic Inspiration Generator is a unique sequencer module that responds to your probabilistic musical direction, starting with the fundamental musical atoms of pitch, duration, octave and articulation, and controlling how likely different variants will be in real time. The SIG+ combines the original Main Unit and 4 track Expander into one single integrated unit, providing the opportunity for fully independent 4-part probabalistic music in a single module. https://www.stochasticinstruments.com/product-page/sig-combined-stochastic-inspiration-generator-expander