What happens if you plug M+ adapter into the newer built-in WM+?

[Galaki]

amp316 said:

You know how if you add two negatives you get a positive.  In this case by adding two positives you get a negative and wind up with Wii Motion Minus.  It makes that awful controls on old Wii-ports like Splinter Cell: Conviction work fantastic.

So, it becomes dual analogs?