Okay, I think it may have been something to do with the flange switch. I took it apart, (then all the contact pieces on the actual switch piece came flying off, should have seen that coming), cleaned it up a bit, and now the pot seems to function as it should. However it’s still intermittent, sometimes the pedal has no modulation and the switch needs to be flipped a few times back and forth for it to kick in, but the chorus/vibe knob seems to work fine now.

In Chorus mode it’s definitely getting modulation. When in flange mode though it doesn’t really seem to have anything, just depth and rate settings affecting the sound.

I was going to try and reflow the solder joints in a bit here, I was thinking there might be a cold joint somewhere as well, but I will check for trace continuity as well. When I switch between flange and chorus mode, there is a pop, is that normal behavior?