Key map need some help

Hi I am trying to use the keymap switch function. And no matter what I do I can not get it to work…I created my expression map…loaded it…went to the editor…checked articulationa nd dynamics…but I dont see any note references to what i did…example…Bridgemute is suppose to be on midi note c1…there is no reference to it…if I draw into the dynamic editor box I get a mf…no midi input…I hope u can understand what i mean…any help would be grateful…read the manual…follow a video I saw on youtube…still nothing…if I draw on c1…I get both the bridgemute and the volume of the pitch substained but it aint muted.

Thank you

Can you post a screenshot of your Expression Map setup window.