SoX can decode all types of Ogg Vorbis files, and can encode at
different compression levels/qualities given as a number from -1
(highest compression/lowest quality) to 10 (lowest compression,
highest quality). By default the encoding quality level is 3
(which gives an encoded rate of approx. 112kbps), but this can
be changed using the -C option (see above) with a number from -1
to 10; fractional numbers (e.g. 3.6) are also allowed.