http://www.macupdate.com/app/mac/18882/lame
I can see the LAME Audio Export: MP3 option when exporting soundbites. At MOTU's support they say:
DP8 tells me to put it into /Library/Audio/Plug-ins/MOTU Audio Export/The LAME.framework should be placed in /Library/Frameworks.
If you do not see LAME Audio Export: MP3 as a choice when you Bounce to Disk or Export Selected bites, the LAME.framework is not installed, or it is installed in the Library of another user. Relocate the LAME.framework to the global /Libary/Frameworks folder.
Neither of them works

Here's what the installer says
What is installed where?
The following files are installed:
/usr/local/bin/lame
/usr/local/include/lame.h
/usr/local/lib/libmp3lame.0.0.0.dylib
/usr/local/lib/libmp3lame.0.dylib
/usr/local/lib/libmp3lame.a
/usr/local/lib/libmp3lame.dylib
/usr/local/man/man1/lame.1
/usr/local/share/doc/lame/html/basic.html
/usr/local/share/doc/lame/html/contributors.html
/usr/local/share/doc/lame/html/examples.html
/usr/local/share/doc/lame/html/history.html
/usr/local/share/doc/lame/html/id3.html
/usr/local/share/doc/lame/html/index.html
/usr/local/share/doc/lame/html/lame.css
/usr/local/share/doc/lame/html/modes.html
/usr/local/share/doc/lame/html/node6.html
/usr/local/share/doc/lame/html/presets.html
/usr/local/share/doc/lame/html/switchs.html
Am I supposed to move all these files into the folder MOTU Audio Export?