More apps like TC-11 (exploring the touchscreen)
The use of the touchscreen was the most relevant aspect for getting me into the iOS world. I play synthesizers since 1983 and even so alternate continuous controllers, ribbons, etc. (I love my Theremin as well ) are fun to play with, the touchscreen is a whole new ball game! It allows for articulations impossible to achieve on a normal keyboard or controller.
I was amazed when I saw the polyphonic pitch bends and aftertouch in MorphWiz and Animoog, and got even more excited when I bought TC-11 with its ultra flexible control assignments.
Then I wonder why there are no more apps like this one... I mean there are many good sounding synths now, but most of them just try to replicate the keys, panels and controls we have on a traditional synthesizer...
I would like to see devs paying more attention to this aspect.