More playing around with hard drive motors. Two linked in line with the output (only an 1/8" jack this time). Squawl tone circuit to make the noise and then spinning the drive motors will interrupt it. To generate the tone thumb on the touch point on the top and one or more fingers on the side finger touch points.
Interesting effect that I like. You do need to fiddle with the signal strength to get the best effects. I have tried playing around with external inputs with this effect but am not satisfied with this approach yet.