[Dave LaRonde] “Export the entire track as an aiff, reimport it and apply filters.”
Only do this if you never want to change individual shots again or take the audio to a post studio. They will kill you if you make this mistake. You would be better off nesting the audio but again beware of nesting.
A quicker way to apply a filter is to open it in the viewer, set parameters, select all audio clips you want to apply the filter to, drag and drop from the viewer onto the timeline and it will put the filter on all highlighted clips as the last filter.
Just copying settings from one clip may put unwanted other filters on all the clips (paste attributes puts ALL filters)