The connection of several tablets with audio and/or midi, as well as a microphone or instruments, can be tricky. What has been established in the computer world for a while now, can still be a challenge when it comes to the tablet: electric power supply, audio latency or different plugs (30-Pin, Lightning, USB-C, OTG). But perhaps it could all be done wireless?
Beeing a musician (live/studio) and music teacher, I was able to gain experience since 2011 that I would be happyly to share with pros and cons, what works and what doesn’t work (yet). Problems some years ago with Apple that are fixed now, are just popping up with Android devices.