That would be good explanation, but each channel gives me 30 ohms-ish to ground, and control gives 1.1k to ground (which I'm assuming is correct, it drops right down when the button's pressed).
I'm assuming I got the wiring right. The control wire has ground wrapped around it as a screen, left is red and right is some other colour, green I think, I know, opposite to normal way. So ground to sleeve, right to ring nearest tip, left to tip, control to extra ring.
All I can think of to do is take the plug off again and try a standard one. If that works I can get far more of the inserts than I need (**broken link removed**) so I could use the original housing, or just get a whole plug and be eternally annoyed...