Really looking forward to this new app to come out by Waldorf.  It really brings the iPad into a new level production, being used more and more as a studio tool.  Well done Waldorf!
Waldorf Nave

“The Nave sound engine includes two novel Wavetable oscillators with sonic possibilities way beyond the scope of conventional wavetable synthesis. While the spectrum of a sound can be transposed independently of its pitch, the waves can be rendered from perfectly periodic to very noisy and anywhere in between. Especially sounds with an accent on formants can be produced easily, which made us integrate a speech synthesizer for the easy creation of wavetables, enabling Nave to talk and sing.”