What if Simon and a MIDI controller were one. You'd get the Roly piano. And what if you melded your iPad with a Theamin.You'd get the Roly Airwave. Together, these two gadgets work in tandem with your iPad Air or iPad Pro to become a virtual piano teacher. Presumably, it's never been easier to learn piano.But can these three gadgets replace a human instructor. I'm Carly Marsh and this is Prove It. I've been making music for as long as I can remember.I've dabbled in a lot. I sing and play the banjo and the t ...