MP3 Export garbled

in Audacity 1.3 the bit rate can be changed by clicking on the options button when you export (save) as mp3 …
mp3 bitrate options on Audacity 1-3#.png
https://forum.audacityteam.org/t/changing-mp3-bitrate-when-exporting/13089/2

For a sample rate of 44100Hz don’t use a bit rate below 128Kbps for stereo if you want good quality sound.