As mentioned in item (6) of my Help2Help-post: if you have no Intervideo AC3 installed: just forget about the page with that name under "Audio" as that page indeed only applies to Intervideo AC3 and e.g. not to AC3-filter. Further, under item (4) is mentioned: "To access AC3 filter's settings from BSPlayer (with videofile loaded) follow: (rightclick >) Options > Filters > Advanced. For general setting purposes you can also access it directly through: [Start] > Program files > AC3Filter > AC3Filter Config". Does this info help you?