Based on the great and very informative work by @h_classen! See …
The premise:
Would be a nice-to-have feature if the speed of the dash lines changes according to local regions, but it seems it would be a bit much for the dash line logic, to be honest.
Version based on CSS variables
I played around using animations and symbols, masked by group overflow hidden. It doesn't have a dynamic aspect that would react to a slider, though… flow-rate.hype.zip (21,4 KB)
Yes! "Sidecar" shows what Hype running on the iPad might look like. I'm guessing an iPad Pro easily has the necessary processing power and the UI controls seem to scale.