In "classes" above you get a list of all types but the best page is:

• A list of all types and functions

of which you want to use the sox_* and SOX_* ones, not the lsx_* and LSX_* ones which are internal to libsox, unless you're writing a new format or effect handler, in which case you want to see src/skelform.c and src/skeleff.c in the source code.

For examples of using libsox, see src/example?.c.