Designed to re-create the sound of a 'Theramin' and offering control either using a MIDI keyboard or using the mouse to drag the glowing spot across the 'chart' for more authentic 'Theramin' style play. Spook Keys also includes the following features:

* sine, sawtooth, triangle and pulse waves
* variable key in and out response
* variable LFO for vibrato and tremolo
* pan, chorus (detuning), stereo spread and glide controls
* filtered, ping-pong, stereo delay.