Hi William and all,
Ithis is a strange problem certainly. I have been following your problem only recently so my comment maybe already reorted. Sorry.
Would it be possible to have a sket of the original mixer and next the schematic of the miser withe the ADE and its pins connection ? This should help to understand the current/signals go around. This should help to understand if the mixer could be wrongli marked having different configured contacts.
Best 73
Gian. I7SWX