Spook Keys is designed to re-create the sound of a 'Theremin' and can be controlled using either a MIDI keyboard or a mouse to drag the glowing spot across the 'chart' for more authentic 'Theremin' 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.