Works very well now, but initially I was confused by why it was getting stuck occasionally. Turns out you can't move it between 4'o clock and 8'o clock, which is reasonable, but there is no visual indication of these limits, so it is hard to understand.
Thanks for the feedback! I agree there needs to be visual indication for the knobs' min and max points. I'm thinking about how to do this without adding visual clutter.
