Can i reach sound object in another swf:file from the main movie

My client want to have a big presentation on the web with speakervoice and big pictures. So i´m going to use the possibilty to loaad movie in a empty movieclip. So its going to be alot of swf:files to load in the main(index) movie.

My problem is that i want to have a “one” button (in the main movie) that can stop all sounds. Even those swf:files (contents) that i load that have speakervoice on it.

is it possible? please help me.