Inputs and Outputs are not updating manually in Human UI

Grasshopper Human UI
2

If you read the error message on the add elements component, you’ll see you’ve broken the first rule of Human UI: Don’t hook the output of a value listener into the input of a “Create” component. (even indirectly). Please review the example files here: Example Files

Every Human UI definition has the following parts:

  1. “Create” components, which initialize a UI element
  2. “Create Window” + “Add Elements” to instantiate the window and put UI controls in it
  3. "Value Listener"s to get values out of the interactive elements in the UI
  4. “Set” components, which can modify or update a UI element you already created.

Your problem (a common one!) is that you’re trying to do #4 with #1. Try initializing the “volume” readout with an empty / dummy value first and setting the actual volume value with a corresponding “Set” component.