Awesome application!
As a possible feature update, it might be really cool to be able to generate the pitch by tilting the phone (and even changing volume by tilting in another axis). Im not sure what the sesitivity of the Accelerometer is, and if it would be of higher or lower resolution that the screen, but it could be an interesting mode to switch back and forth from. Another cool option would be a "quantize" mode, where even though you would "hear" all the frequencies as you move from note to note (a portimento like feature), you would "land" on properly pitched notes?
Thanks for the amazing Application!
maxizod about Thereminator