Cl-sndfile is a project mainly written in ..., it's free.
stub for libsndfile lisp bindings
Just a stub for libsndfile cffi bindings. Generated with SWIG.
You probably wont need to make anything, just load with asdf and use. All generated bindings are in cl-sndfile-swig.lisp
(push #p"/path/to/cl-sndfile/" asdf:central-registry) (require :cl-sndfile)
CFFI manual: http://common-lisp.net/project/cffi/manual/html_node/index.html
Planning in future: Create upper level interface to libsndfile