DC motor on exposed spring reverb tank

Some resonant, twangy drones

I’ve used motors for similar things before and tend to use my own system using an Arduino and Max patch to control the motor speed, but I have just gotten a new, simple motor controller that a friend designed, so chose to put it to good use.
If you happen to need one, let me know and I can see what I can do.

It can get violently distorted. Can imagine a few designs that could use this as primary source.