quick and dirty theremin

Jay here,
Got a pooder? Got a mouse? Go to http://sagebrush.com and download mousing.
Horizontal motion of the mouse changes pitch, up and down changes volume.
You can choose 4 degrees of vibrato and 10 increments from sine wave to
square. All manner of sampling rates and mono/stereo. The aliasing does, I
think, contribute positively to the sound. It also displays the frequency
as you move. You can save your results. Have fun.