Export your Audio or Music Files from Audacity with Easy Options - BluSky
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How to Convert Audacity Files to MP3 - YouTube
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 Export an Audacity File As an MP3 in 2 Simple Ways