Exporting MP3 files at 128 kbps and not 224 kbps


I am recording a weekly podcast for a talk radio show. The station administer has complained that my mp3 files are causing problems to their system and that he needs to transform them from 224 kbps as received from me to 128kbps.

Looking through the settings in preferences on audacity on my computer I am not seeing an option to configure and save at 128kbps. What am I missing and where should I be looking?

Thanks a lot.

In the Export dialog options: http://manual.audacityteam.org/man/file_export_dialog.html#options