Axiom 49 Classic

I’m trying to create custom script for my Axiom 49 Classic. I have 8 knobs set to control selected track sends in Ableton. However, the script doesn’t work. I tried changing the pickup from non-value scaling of which none worked. If I map the knobs in Ableton directly they work, but I want to control selected tracks, and not just one track. Any help would be greatly appreciated.

Thank you