Currently Being ModeratedFeb 6, 2013 3:25 PM (in response to fenderguy4life)
A phone may be able to replace a computer for many things but to do recording, mixing and mastering power and a big screen are still the best way to go.
As for interface you can now find them that work on both os x and ios machines. I have a apogee Mic and a alesis i/o4 that work with my macs and iPad.
Just look for a interface that works on both.