We need a bit more info here. What is a 10?  Assume it’s a Samsung or Amazon tablet. 

As for switching. There is no switching involved, the app is just a controller and holds no info. The system details and functions are managed by each speaker. Just install the app, be sure to “connect to existing system” and away you go. You don’t need to remove or switch the app from any other device. 

Up to 32 controllers can be simultaneously active.