DesignByPaul has E Theremin – Electro Theremin (iTunes Link) for the iPhone and iPod Touch in the iTunes App Store for FREE (regularly $4.99) for a limited time.

This app is inspired by early classic slider controlled synthesisers such as the Ondes-Martenot, Trautonium and Tannerin/electro-theremin.

The E Theremin has three oscillators that generate a rich fat analogue tone, with a choice of 4 waveforms (saw, square, triangle and sine) octave shift and amp control. The E Theremin can achieve portamento, vibrato and quarter-tones with precise control. 4 presets allow you to store your sounds and jump quickly between them during performance.