That didn't go well. Time to try again, and hopefully get it right this time.
[edit]Nope, NFG. Hard to imagine what is screwed up this time, going to try it on another source and make sure that isn't the issue but I don't expect that to change things. I definitely had the wiring wrong the first time but I'm pretty sure that I have it now. Each channel output is connected across one wiper of the pot with the (#2) wiper pin tied to the (#3) input pin and the in-phase signal connected to this side. The out-of-phase signal is connected to the (#1) ground pin. This is with an Alps RK27. Each channel input is done similarly with a 33k resistor in series with each connection. The output wires are connected to the PIMETA boards at the center two connections in the RK27 footprint, that seemed like the only logical place to do so. I guess I'll post pictures later.