Ableton program auto change

This is more of an Ableton related question but I’m new to it and didn’t find a guide that worked for me:
I want to play with Ableton in the background to be able to change programs as the song goes while also playing some playbacks (I have songs with changing tempos and I want the band to just play without worrying). How do I connect Ableton programs to GP? I have a windows machine so I guess I need midi ports?

Did you see this recent discussion?