@spec to_source(TuningFork.Composer.t(), keyword()) :: String.t()

The composition as source, or "" when no track is audible.

The result is formatted and depends only on tuning_fork. The score is bound to a variable named after the project; a name that would not compile as a variable is slugged, and a project named "track" binds to song.

Options:

• :output — what the last line evaluates to: :score (the default) binds the score, :wav writes <name>.wav, :kino returns a Kino.Audio.