Depends on the controler, i dont know if its possible to assign a note midi signal to the slider on your unit. If its possible you shuld do it in the editing mode of your controler or trough a editing softwere for your controler.
Its possible on a BCF2000 unit, but it also has buttons so im not using it.
i'm using a doepfer pocket dail and a pocket fader. can't really figure out how to configure it... i wish i could make the layer active when changing it (like layer speed).