With its accelerometer, digital compass, and sound generation capabilities, the iPhone has become a popular platform for theremin simulator applications. We've put together a handy round-up of all the theremin apps we could find. Many of these are also available for the iPod Touch or iPad too.

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My favourite is Spooky Vibe. (iTunes link)

Tilt up and down for pitch, slide finger left and right for volume.

Slide finger up and down for depth of vibrato, tilt left and right for speed of vibrato.

Choice of three continuously variable pitch voices and one quantised voice, also three vibrato waveforms and adjustable attack and release on notes.

Budget price. (£1.19 in the UK.)

And a picture of a cute ghost with a little bit of animation. Woo.

Website here