Recording Quality Issues in SL

I've been experiencing a tinny/echo quality to my published recording that is not there when I preview or use the audio editor in Storyline.  Any suggestions? 

I see for Presenter (http://www.articulate.com/support/kb_article.php?product=ap9&id=ba2r62idrdf0) you can change the bitrate to help with the issue, but I can't find that option in SL.