On reflection it’s the variable filter which provides most accurate keytracking IMHO
I mis-remembered what was officially confirmed before, need to hunt down the comment
Even at +/-32 there is a difference between the fixed filter and the variable one, the fixed filter is not great over an octave, maybe I need to recalibrate, but at a middlish freq spot +34 is more like 100% (the variable filter is consistent both ways)
So it’s only really possible to judge against the variable filter and i’d say it is -200% to 196% and there’s no way to edit that further (keytracking is sadly not available as a source for modulation)