SCANNER takes a 0-5V input voltage and turns it into 4 0-5V overlapping triangular output voltages.
A classic "weirder to type about than in practice" module. Scanner is useful for driving VCAs (for a 2-4 way crossfade), waveshaping (any input wave comes out a triangle), and probably lots more!
The individual outputs are not truly named but: arranged in a square, progressing clockwise, if you call the lower left "A" and the lower right "D", this diagram shows the input / output relationship:
Where the input is the sum of the bottom knob and the two input jacks. The left goes through an attenuverter controlled by the top knob, while the right goes straight in.