Dear customer, first of all, it should be clarified that regardless of the source switching method, the sofabaton system selects the input corresponding to the activity from the input menu of the device.
So before creating an activity, please make sure to complete the source configuration of your Denon device (Devices--Denon--edit---source configuration), add all the input options you will use, and create a complete menu. This way, when creating different activities, you only need to select the corresponding inputs.
The problem you're having is that there is only one input in the menu, and every time you change the input, it replaces the newest one. This resulted in a mess of inputs. A subsequent update to the app will change the process to avoid confusion. The new process restricts adding new inputs directly from startup settings, and you can only select the correct one from the options already added, i.e., you have to complete the source confguration in device settings before you can create an activity.