Reply to LED output for modifiers

So I'm mapping my APC40 for traktor, but im having troubles setting up the LED outputs for my modifiers.

I have 4 buttons.
Button 1: Set modifier 1 to 0
Button 2: Set modifier 1 to 1
Button 3: Set modifier 2 to 0
Button 4: Set modifier 2 to 1

Im basically using them to swap between decks A and C and B and D, and I would really like to have the LEDs mapped out so that when modifier 1 = 0, button1 lights up, when modifier 1 = 1, button 2 lights up etc.. So I can tell from a glance which decks I am controlling.

Right now all I can do it get the buttons to stay fully lit up haha, and are unaffected by the state of the modifiers.