@photofractal
Is the issue that the negative CV isn’t doing anything, or that it is working, but the whole module is running too fast?
It does look like something strange is going on with the FM input -> clearly the channels are oscillating at very different speeds, even though INTONE is at 12:00. Thus I believe the FM knob is applying some small offset value in the INTONE direction.
Try turning the FM knob very slowly clockwise, and see if there is a point (close to 12:00) where the channels slow down to a near stop. The linear-FM can tend to dominate the TIME control at very slow speeds. If this works I can work out some kind of different scaling for that control, particularly at slow speeds.