I just put together this filter board and it seems like the feedback is set to 100% regardless of where the pot is. Is this the “clock latchup” referred to in the build document? I replaced R58 with a 32K resistor (all I had on hand) and it still didn’t fix the problem. Could there be another issue or is this most likely a bad PT2399 chip?
It also seems that when the delay time is put past @ 120, it starts to really distort to the point of sounding like something is wrong. Related to a bad chip problem?