This is a Heroku buildpack for using audiowaveform and lame in your project.
It doesn't do anything else, so to actually compile your app you should use heroku-buildpack-multi to combine it with a real buildpack.
To use this buildpack, you should prepare a .buildpacks file that contains this buildpack url and your real buildpack url:
$ ls .buildpacks ... $ cat .buildpacks https://github.com/lepinsk/heroku-buildpack-audiowaveform $ heroku create --buildpack https://github.com/ddollar/heroku-buildpack-multi $ git push heroku master ...
You can verify that sox is installed by calling:
$ heroku run "audiowaveform"
Copy the snippet above into CLI.