Barebones Theremin.

Fun graphics and good sound. At 99 cents its a pretty good value, but if you are a Theremin fan and want features, the Theremin-ator looks like itd be the better choice. Im thinking I should have gone with the latter.

This one has a choice of three wave forms (sine, triangle, square), but youd really only want Sine. It has a good range. Pitching the phone left to right changes note low to high. Aiming the phone down while on the left lowers the note more, while doing so on the right raises it higher.

Having some echo would really bring it to life. Not having any dynamic volume control is problematic (I use the volume slider)

Alonzomachine about Theremin