2-to-4 Mix Matrix

This simple module takes in two inputs (CV or Audio). It produces four outputs that are various combinations of the two inputs. It is based on Julius O. Smith's description of a mix matrix for Schroeder Reverberators (https://ccrma.stanford.edu/~jos/pasp/Schroeder_Reverberators.html). Despite its original use for spatializing audio (stereo-to-quadraphonic), this is an even better module for creating CV permutations