Product description "After Later Audio - SUM+INV"
Mixing the two upper and lower inputs together you can sum the oscillator outputs of the two COCO oscillators Cascades and Brooks. In addition, the SIN (Cascades/Brooks) and COS (Cascades) feed each channel, giving you four different phases (0, 90, 180, 270).
The COCO system is intended to provide the deep sound-shaping benefits of a complex oscillator, while compensating for certain drawbacks such as lack of flexibility.
Within the COCO series, oscillator functions and control module can be selected and combined to form a complex oscillator, but remain usable standalone if needed.