Sone Slider

Remaps YouTube's volume slider to be perceptually linear. YouTube's volume slider is linear in amplitude, but the way you hear sound is not. The result is that majority of the perceived control is in the lower 20-30% of the slider, making it difficult to precisely adjust the volume. Sone Slider intercepts the volume API and applies a power-law curve (`amplitude = slider^(5/3)`) so the slider behaves perceptually. Moving the slider changes the loudness by the same perceived amount regardless of where you are in volume range. The popup shows the remapped curve alongside the default linear response, with a live marker at the current volume. There's a toggle to disable it if you want to compare.