Shruthi, Polivoks filter. Set Filter type to PVK.
However, when I’m in Filter Mode LPF, there’s almost no sound – perhaps 10% the volume when it’s in BPF mode. I tried changing a bunch of different settings of the Oscillators and Filter, but nothing I do will make LPF mode have a normal range of volume (to hear it I have to turn my Mixer up to a crazy level).
The only thing weird I see on the PCB is there’s R32 and R33 but they aren’t listed in the BOM and the schematic says 0 here. Are they supposed to be jumpered with wire? (later: put wire here, didn’t help).
I also checked and there is continuity from IC6 PIN 6 to IC9 PIN 13 (LPF pathway). VCC / VEE is OK and all pins on IC6 and IC5 (LM4250CN) are checked for continuity to their nearest neighbor.
What am I doing wrong? Or what might be wrong with the filter board?