Reply to problem with loop LEDS on launchpad

Hey guys!

Okay, so on my launchpad I've got 4 button set, so that but1 drops a 2beat loop, but2 a 4beat loop, but3 a 8 beatloop and but4 a 16 beat loop.
this is all fine, no problem

My problems is in the output:
I want all 4 buttons to constantly be a dim green, and then when I press each, hence activate that certain loop size I want the button to light up bright green.
(dim beeing midirange 28 and bright beeing 60). Then obviously when I deactivate the loop, or switch to another loop size I want the light on the first to be turned down (and the new to be turned up)

I've tried everything and just can't get this to work!
Any help is appreciated!

(I'm on windows using traktor pro2)