Convert batch of mp3 files from 320 kbps to 128kbps bit rate

Hi, Is there a way to convert a batch of files all at once to change the bit rate from 320 kbps to 128 kbps?
Windows 7, Audacity 2.04. Many thanks.

http://manual.audacityteam.org/o/man/chains_for_batch_processing_and_effects_automation.html

That may give you a 128 size file, bit the quality is less than that. You get 128 quality only when you start with a perfect, uncompressed WAV or AIFF. If you start with an MP3, you get the new sound damage plus the compressed damage of the original. Starting with 320 is pretty good, so you might not notice it, but be aware it’s going to happen.

Never do production in MP3. There are messy surprises.

Koz

Thanks so much!