Hi for what it's worth, audacity 1.1.3 (the one with planet ccrma) has a bug exporting mono mp3 files. It's corrected in 1.2 : extract from http://sourceforge.net/project/shownotes.php?release_id=175498 : Changes Since Audacity 1.1.3 ======================================= [snip] Mono MP3 files now export at the correct speed. well, I learned it the hard way :-p cheers GuyCLO~