Ok. So I redid a lot of the wires and their routing and touched up several solder joints. I also moved the master volume pot over next to the presence pot so everything has a shorter, more direct route. I’m still getting the oscillation. Now that I’ve turned things up a bit, I can tell it is happening on both inputs. It’s just much more noticeable on the high side and worse when the treble is turned up. Here’s some updated pics. Any ideas?