Bill, Very nice job on the filter controls!
Originally there was a slider control for passband shift. You're using a slider for dynamic filter width and that works beautifully. Any thoughts of using a second slider below the filter width slider, for passband shift? IMHO, a slider is a much more 'natural' control to use, especially since it already correlates well to lateral shifting of the passband.
73, Dale WA8SRA
