Not bad for 99 pennies...

Ive built and played all sorts of theremins and was excited to see an app for the iPhone. My major gripe is the lack of true control over pitch. Wildy jumps an octave or two when you are going for a small interval. The tracking is just not consistent. I suspect this is a short-coming of the iPhone itself, not the software. What I do like about this app is; the nice vibrato control options, the 3 different waveform options and the "chromatic" option. What I would like to see in future releases; better movement-to-pitch tracking(most important), simple reverb or delay, and filter/tone control for the waveforms.

TuttleSoundlabs about Theremin