I’ve made some changes to the knob that @Tom Larkworthy wrote, to allow for two-way data binding. You can check out the notebook here https://observablehq.com/d/73ba2241579fa9dd#cell-47 I’m noticing some oddness when trying to manually enter values in the numeric input that is tied to the range control. Typing 0.7 for example appears to reset the input to 0.