So far, nobody's mentioned how to get to the aforesaid knob in the first place, or alternatives to manipulating it. Navigating with the mouse is a poor second to precise locating, and using qwerty actions to set values, be it a knob or slider, is more accurate. So, tab, or an associated action to get to the knob in the first place, and something like ALT+ up/down arrows (as an example) to change the knob value. Then it's irrelevant whether the knob responds to mouse up/down/left/right, or mouse wheel, for users who find those options second best, when a more efficient and precise option already exists. For graduated speed in the case of a spin knob (starting slow and getting faster), the user only needs to keep the actions pressed. Alex. -- www.openoctave.org midi-subscribe(a)openoctave.org development-subscribe(a)openoctave.org