I have found a few places that have exported their Bloopsaphone tunes to MP3 but I cannot find out how to do this.
Try Bloopsaphone version 0.4.1 by Viking: gem install viking-bloopsaphone
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That version's Bloops object got a brand-new #record() method to save the output to a .wav file. You can turn it then into mp3 using your favourite encoder.