Cad is working on the English manual, I am working on the German one. It’s a very complex task - my current draft has 81 pages, and there’s still lots of chapters missing.
In the meantime, feel free to ask any question here. I don’t exactly understand what you are trying to achieve with the playlist and the cartwall. Do you want to trigger a “Next” in the playlist when you play a certain cartwall item? Generally, you can just add an “Execute Command” action to the “Actions on Start” or “Actions on Stop” list of each item, and then execute any command, e.g. AUTOMATION 1 NEXT.