IR3109 board problems

I’ve been building this on and off for some time now and I am finding that the Cutoff sweep is not correct. The filter does not open when the Cutoff is turned fully up. I suspect a control voltage problem but I do not know what the correct control voltage range is to the CV input pin of the IR3109. Can anybody help ?.

How far does it open? Key tracking on the Shruthi is turned on by default. You may want to try turning it off in the mod matrix with “note” “cutoff” “-63”.
Or, you can route env1 with a sustain of 127 to the filter via the filter env parameter on the filter page to see if that opens it completely.