@jashkenas I have been able to make a nice custom slider from yours, thank you! See the “scale” slider in the notebook below. I’m working with an array representation of “golden numbers”, where [a,b] encodes a+b*phi.
The notebook also has an attempt at a “vector” control, using three of the number sliders, but I haven’t been able to get it to update the value of the cell. I’m no expert on inputs, so perhaps I just don’t know the right event to handle. Can you offer any tips?