Each group comprises of two inputs with their input levels and polarity set by the dual polarizer. If nothin is patched to an input, the according control generates an offset voltage from -5V to +5V. The two signals, no matter if offset voltage or the scaled input(s), are mixed at the ±A±B output.
LEDs for each input visualize the signal intensity and simplify suppressing the signal in center position which is not marked by a center detent.
Using a switch the group can be normalized to the group below (group 1 to 2 and group 2 to 3) which of course has an effect on the mix configuration. This way it is possible to use groups 1 and 2 as a four-input mixer and group 3 as a separate two-input mixer or for other functions. Or you use the entire module as a six-channel mixer.
per group: A input, B input, A+B mix output
3U Eurorack module, 6HP wide, 40mm deep
current draw: 80mA per rail