Reply to BCD 3000 PFL Knob map in Traktor Pro2

Hi guys, how are you?

I have a Beringher BCD3000 and i was a VirtualDJ user. In that software, i used the BCD3000 knob called "Phones Mix" to pre listen my tracks without using any button. When the knob was at 0% I could hear Deck A, when it was at 100% Deck B and in 50% i heard both Decks mixed together.
Now, I'm a Traktor Pro 2 user and my problem in is that I have to use buttons to set the monitor cue and then use the Phones Mix knob to pre listen each track, hearing the cued track at 0% and the "master" at 100%. What I need to know it's how to map this knob in TP2 to make it work like it worked on VDJ and put aside the monitor cue buttons.

I'm sorry if theres any grammar mistake in this post, i'm from Argentina so my english it's not that good. If someone didn't understand something, let me know.

I'll really aprecciate your help.