If as you say you made a wave file and then changed the 'extension' to MP3 it is not suprising that folks cannot hear them. MP3 is a compacting utility like pkzip. A 5 meg wave file is compacted by MP3 to as little as half a meg. A player trying to uncompact a wav file will either lockup or fail. A simple solution is to resave the files with a 'wav' extension at the web page. Hope that helps