getBytesTotal on external clip

i've done something like this but i can't remember how - i'm trying to load in external SWF's and do a simple loading check on the imported movie - i've got an instance of a blank mclip on the stage (_root.audioHolder) and i'm saying _root.audioHolder.loadMovie(path) - I'm then, in a couple frames, checking _root.audioHolder.getBytesTotal and it's only saying 4 - it looks like it's just getting the total bytes of an empty instance of audioHolder - i don't have any mclips in the clip being imported, just an audio channel that starts playing correctly on import - how can i check the bytesLoaded and bytesTotal of the imported clip?

please let me know if that doesn't make sense