Both sections of the S.P.O are same regarding signal flow and functions:
First of all two signal inputs are summed which corrsponds to a two-channel mixer without level controls.
In the next stage the mix passes a polarizer, allowing you to scale/attenuate the signal from maximal level to zero, both positive and inverted: in center position the signal is muted, left of center the potentiometer acts as an attenuator and left of center position as an inverting attenauator.
Last stage of one channel is a bi-polar offset control, allowing for adding a fixed voltage from -5V over 0V to +5V to the scaled signal.
A two-tone LED gives information abut polarity of the signal and/or the offset voltage: blue = positive, red = negative.
Each of the two sections offers: input A, input B, output
3U Eurorack module, 4HP wide, 25mm deep
power consumption: 20mA @ +12V and 20mA @ -12V