With the knobs, I just figured out the problem was a stray div from an earlier version of the app overlapping the knobs in the components section of the demo app. I've fixed that now. Checked in both desktop and android Chrome and looks ok. haven't tested in mobile safari yet.

P.S: I agree knob controls in general are terrible UX. A real knob is usually turned with two fingers and the way on-screen knobs are operated is nothing like that.

Same on Brave on Android. But I think that's largely orthogonal to the design, which I like a lot.

Both performance and mechanics of the knobs :|

The knobs are especially difficult to use (on desktop here). The first two knobs only respond to click & vertical drag - moving up rotates clockwise, moving down rotates ccw. Moving left or right does nothing. The second knob's grab handle is just totally wrong, appearing in only about the 4 o'clock to 6 o'lock position.