Hopefully this thread will continue. There are some very interesting systems shown here that I’m satisfied are beyond my technical and financial abilities. Reading through the build threads this past year, many lacked photographic documentation of the controls. For example I believe there are some powered by car battery and I wonder what they used to control the engine speed. What alternatives folks use to control the blocks on an analog set up. Air operation of switch settings with a coke bottle has off the grid potential. Anyway I’m hoping more contributions will be made here.