Low-Gain Electronics SubMix6
The module is divided into two identical sub-units A and B which already are individual 3-channel mixers with their sub outputs Mix A and Mix B. I naddition we find an output carrying all six mix channels (Mix AB).
Especially when attenuating inputs of passive mixers cancellations may occur. With active inputs (unity gain buffers) as used on the Low-Gain SubMix the load on the summing bus stays constant and you get smoother/more gradual mix regardless of the load on the input. The module was developed for audio but you can mix control voltages, too. Beware, mixing audio and CV signals simultaneously can generate offset voltages and cause distortion.
6 inputs (each 3 per sub-mixer A and B)
3 outputs: Mix A, Mix B and Mix AB