Thanks man.
I use a Presonus 1818vsl USB interface which gives me 8 preamps with phantom power if needed. I also have a Behringer ADA8000 8 channel preamp that I can connect into the Presonus via an ADAT light pipe to give me a total of 16 inputs. The iPad and Auria don't even break a sweat doing 16 tracks at once in 24/96 although I usually use 44kHz.