> I am quite confident that a skilled musician with an iPad (or, even more obviously, an electric keyboard with a MIDI cable to the iPad) can create music that is indistinguishable from a human playing a piano. The synthesizer will be able to replicate the sound of the best concert grand in the best auditorium, direct to your studio headphones.

Perhaps this is true, but it is entirely limited to replicating a _recording_ of the instrument. An iPad cannot replicate (or even come close to) the sound of a human playing a piano that you hear in person.