I just realized I posted this to LAD but not LAU. Since the whole point of HIGs is to be reflect user rather than developer needs, I am reposting it here. OK, so if I were to start writing the Linux Audio Human Interface Guidelines based on all of the feedback from this post, I would say something like the following. I have used the type of language you would find in an Internet RFC. "Sliders MUST be operable with the mouse wheel. This MUST only be enabled when mousing over a slider, otherwise, the mouse wheel MUST retain its normal behavior of scrolling the window. For a vertical slider, rolling the mouse button away from you (hereafter: wheel-up event) MUST increase the value of the parameter, and wheel-down MUST decrease the value. For a horizontal slider, wheel-up SHOULD increase the value, and wheel-down SHOULD decrease the value by default. However, this behavior MUST be configurable. If a system-wide facility to control this is unavailable then the app MUST provide a configuration mechanism." Additional submissions are welcome and in fact essential, since the above only covers one aspect of one widget's behavior. Lee
