Set up the Rails app and database first by following the README here https://github.com/xavriley/overtone-docs
Then clone the overtone repo to your local machine
git clone firstname.lastname@example.org:overtone/overtone.git
Then clone this repo, cd into the cloned directory
Change the project.clj file to use the version of overtone you want to index as a dependency.
You're now ready to run lein run "/path/to/my/overtone"
Which will whizz through all the functions in overtone, and hopefully add them to your local postgres database.