midi learn problem

Hi,
Trying to link a midifighter twister up… so far i’ve loaded the nanokontrol mapping with a nanokontrol and see that that works. connection manager shows both device as mapped, and midi tracer is seeing messages from both the nanokontrol and the twister.
when i try to “cmd-middle click” on anything (just trying a fader on channel 1), nothing happens. i’ve tried both steermouse and better touch tool to make sure my three finger click on trackpad and middle click on the mouse are working. the gui just doesn’t seem to do anything when i try to enable the mapping mode. will you please share any ideas to get around this?

well at least on my computer, OS X 10.11.2, it’s “CTRL+OPT+Middle-Click”, not “CMD+Middle-Click” as shown in what i think was the right documentation