Na página do manual soxformat(7)
:
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.