If you cannot find a related parsing file, then you can alternatively simply rename your audio file so that it does not match the name of the original, unaltered .ac3 file. For example, if the original, unaltered .ac3 file was called: "racing_car_soundtrack.ac3" then you could modify it with ac3fix (if that's what you wish to do - I'm not saying you should or you shouldn't - that's your choice, not mine), or whatever program you wish to run the .ac3 file through, then rename your new modified .ac3 file to: "racing_car_soundtrack_MOD.ac3" That way, Scenarist would automatically create a new parsing file for your .ac3 soundtrack, purely because it has a different name. I don't use Scenarist myself (I can't afford it, so I never had the inclination to invest too much time learning a program I could not potentially use on a commercial basis), but I am fairly sure it parses both audio and video files, as, indeed, does Maestro. Arky ;o)