For at justere komprimerings kvaliteten skal du bruge -C og du kan læse hvad den skal hav af værdi her:
http://manpages.ubuntu.com/manpages/karmic/en/man7/soxformat.7.html
.ogg, .vorbis (optional)
Xiph.org’s Ogg Vorbis compressed audio; an open, patent-free
CODEC designed for music and streaming audio. It is a lossy
compression format (similar to MP3, VQF & AAC) that achieves
good compression rates with a minimum amount of quality loss.
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.
Decoding is somewhat CPU intensive and encoding is very CPU
intensive.
See also .mp3 for a similar format.
128 og 128000 er der med også alt for høje værider og du skal sikkert have noget i retningen af 4