Can't get lame to work with audacity - Windows - Audacity Forum
Exporting using an external encoder program - Audacity Manual
Audacity tutorial: Converting to mp3 or AAC and other formats, example: Matthew Smith - epic orchestral synth music for film and game effects; Buanzo's LAME mp3 library
How to Install the LAME MP3 Encoder for Audacity | geekyprojects.com