for CV in, for pitch is already quantised to a 12 note scale, even without a quantizer, i.e. it generates a note, but no pitchbend (bug/limitation ?!) - so id only need to use scale fx, if i wanted to fix it to a scale (e.g. major/minor)
you don’t need any root note - the cv is converted to a note, this can be ‘calibrated’ via the cv options if necessary , then the scale fx, has the ‘key’ (=root note) as well as scale.
i saw, before you edited, you said you were doing cv in -> cv out, this is not something ive tried, Ive always used either for CV IN -> midi/sequencer or sequencer/midi to CV out.
(i.e. I’m using it as a sequencer, or cv to/from midi converter)
if your having an issue with cv in->cv out, perhaps there is some kind of cv ‘thru’… id have to set up some more gear to test that one