@d-healey Yes. I do have a high dpi mouse and now you’ve given me something else to worry about and have to test for. I did not think that dpi could be a factor.
Based on what I figured out rooting around the Hise source it seems like all sliders in Hise are set to absolute px mode as default with a value of 250 distance = full rotation. But when you turn on the modifier they switch to a velocity mode. The problem I had is that the velocity mode settings weren’t any good (at least for my mouse) specifically the offset aka minimum.
https://docs.juce.com/master/classSlider.html#a47c37989ff5f6453f2c44f1a7455e1c1
I found a setting that makes things much smoother and more predictable. But I guess I have to test with different mice?? Oh joy.