Sruthi Polivoks CV ranges

Hi, I have built the Polivoks Sruthi filter, intending to use without the digital control, so to that end I have installed the BP/LP & FM switches.

At this point I am only getting mild filtering & resonance. I rigged up a set of pots to deliver 0-5v on each set of CV inputs. I suspect I need wider ranges for the full effect.

Can anyone advise what CV voltage ranges the module is designed for ?

Thanks in advance, Martin

0V to 5V for both cutoff and resonance.