Prophet 600 Filter CV In not working

Hello, I have a Prophet 600 (with Gligli) that I love. I recently got a CV pedal (yes, an actual active pedal that sends voltage), but is it not affecting the filter cutoff at all. I opened up the synth and tried to apply some of the synth’s own voltage and a 9v battery to the input with no luck. I also swapped around the 3360 for ext filter CV with another 3360 with no change. Any thoughts on where to troubleshoot next?

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