It can happen that the mAirList Play and Carts faders are the wrong way around on the mixing desk in Studio B. We aren't completely sure what causes this but this is how to solve it yourself:
1. Close mAirList
2. On the taskbar at the bottom-right corner of the screen, click the ^ and then the icon that looks like a speaker:
3. Click on PC Carts (2 - RME HDSP 9632)
4. Click on PC Play (2 - RME HDSP 9632)
5. Restart mAirList
The faders will now be the correct way around.