I am feeling little challenged - something that I am sure will be a consistent phenomena for the next 6 weeks. Learning the concept in "windowspeak" and then translating to "macspeak is a bit of a learning curve. I found the method to set a bit rate of 64 for the Mac version of Audacity is established in Audacity preferences> File Format> MP3 Export Setup then the drop down menu> 64. If I have posted this entry twice - it maybe the beginning of that head knocking thing I heard about.