b:22 is a high-accuracy cascading mixer. it features three identical sections of two inputs mixed into one output, which cascades further as a third input of the section below it. This way, the module acts as either three 2:1 mixers, a 2:1 and a 4:1 mixer, or a single 6:1 mixer. It is DC coupled, which makes it an excellent choice both for audio and CV.