Especially when you want to switch things the same time, you have to plan your scripts well. Similar to LayerSets it’s possible to switch several content with the help of the API, exactly the same time:
THE API CANNON:
Download the demo to see the difference between command by command and the API cannon:
https://drive.google.com/file/d/11vNPfPRzZV0n-X4zmsBYnUNsnPI9qykL/view?usp=sharing
Description:
Click on one of the LayerSets - “one by one: go!” and “API-CANNON: fire!” - to see the difference between the both ways of scripting. Give the script time to execute. You could add another Automation-Layer to bring more dynamic inside of it to be able to load your cannon with certain/particular/different Endpoints.
I used it, when I had to switch an ATEM to another channel (and the same time it’s filled PIP-window-layer to the special zoom-in position). However, the one-by-one scripting method is great too, because some movements - on the other hand - have to look more organic than others.
And finally, with the help of LayerSets you’ll get a single API-Endpoint to run the cannon. 
