I didn't like the sound of the original circuit two much so probed about a bit and ended up with this circuit bent version with a bit more flexibility and enough knobs for a rasta colour scheme.
The left toggle produces continuous or interrmittent tones via the black 'punch button'. The right toggle adjusts tone and the red button changes the waveform from square to, er, weird. Two body contacts on the back add some 'wobble' to the sound. Red and yellow are the two standard dials while yellow uncovers hidden sounds. A full video and circuit diagram will be posted eventually...probably. For now here is a video of breadboard prototype which shows where these sounds actually come from.