aw. I think I found my answer from the Mutable site:
"The following equation describes the operation performed by each channel:
Where Vout is the output voltage, Vin the input voltage, Vmod the control voltage, BigKnob and SmallKnob the position of the big and small knobs, represented as a number between -1 and 1 (0 being the 12 o’clock position)."
So… unity, I guess.