iRV 34 Stereo System App

Looks like the Apple Apps for iRV are all 3rd party from a company called Patrick Industries Inc. I downloaded the "New" one and it seems to somewhat work but I still have questions. Maybe I need to understand the IRV 34 better. My problem is the zone 3 or outside speakers. The App has 3 zones then a fourth zone called Z3. That one seems to control volume outside. It also appears that you can have a different source inside then outside. Can anyone help with that please? I'm expecting the app will not control all features of the unit but I'm surprised so far how much it can do. I'm able to Bluetooth link my iPhone with the Sirius XM app then open the iRV app to adjust volume from outside. I'd love to learn more. The TT has the In Command system also. So from the comfort of my zero gravity chair I can do most everything expect get a beer out of the outside fridge. Has to be an app for that. Is this what they call Glamping?
Thanks for any technical help on the iRV system.