I think I determined that it was an audio transformer, actually I believe it was a telephone audio transformer! I used one of the little Xicon trafos, and I assume it worked, however the mixing of the 2 channels on my build did not work properly, and I suppose this could be related to the transformer. I don't really understand transformers too well outside the standard rectification or DI box uses, so I was never sure what it does in this circuit. One guy at the other forum said very matter-of-factly that it was a voltage doubler/oscillator/rectifier doodad. The guy knows way more about EE than I, but I doubt that he's right on this one.
I wouldn't recommend delving into it until we get a better PCB layout that does away with most of the wiring, and a schematic.