Trying to configure Cartwall


I’m trying to do some things with the cartwall, but i’m unable to find out the solution.

First problem:
I want to change the color of the carts, but when I modify the skin.ini, nothing change (I’ve read the doc)

Second problem:
I have a 4x4 cartwall, each column is assigned to a fader on the console. When I press ON on fader 1, I want the selected player of the column 1 to start playing, but I can’t find a way to do this.
I’ve read about an existing "CARTWALL COLUMN " command, but can’t find how to use it.
Could you help me ?

Thanks !