The iPad on the left is for mixing DJ-style on breaks, the one on the right has a Karaoke program for my guests, and it feeds a monitor that they can see better. We all know people HATE to wear the proper eyewear in public, right? Then, there's the 4x screen that has all the bells and whistles I need to navigate this space station.

Oh yeah, that teeny-tiny mixer way off left mixes the two iPads into the main system for smooth fades, and no dead air.
https://www.amazon.com/Pokket-Mixer-PM11PUR001-Mobile-Mini/dp/B00970IFGU?th=1