Out of curiosity, are there Linux tools to go from binary files to audio and back again? i.e `cat archive.zip | faxify -wav > archive.zip.wav`
Encode to opus:
cat foo.zip | minimodem --tx -r 300 -f out.flac
opusenc --bitrate 64 out.flac out.opus
minimodem --rx -r 300 -f out.opus > foo2.zip