Reply to Mapping help needed

Hey guys,

I have browsed around and just can't find what I'm looking for, or understand

I'm trying to map my Mixtrack Pro in Traktor, all the buttons are how I want apart from a minor detail.

I'd like to add a modifier to the TREBLE (A/B) knobs so that once selected it runs GAIN. I managed to get it to work via the 'back' button but that then messes about with my browsing function. TICK is a button I'm finding that I don't use but when I managed to map to it I lost the BACK function.

OFF >> TREBLE
ON >> GAIN

Any help would be appreciated.

Thank yoooooooou