Also they are horrifically broken if you use OS-level magnifier (ctrl+scroll etc). I don't know if this is the application devs' fault or not; I haven't investigated OS mouse warping APIs. Warping the mouse back to the center of the knob goes in a feedback loop with the magnifier and spams crazy mouse events such that every knob will immediately go to min or max. Really shameful accessibility fail that no one cares about.